Check out <a href="http://yoast.com/wordpress-debug/">this great post from Yoast</a>, who gives a tip that very likely every Theme reviewer will find incredibly useful: enabling debug mode with a URL get parameter:<div><br>
</div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div><span class="Apple-style-span" style="font-family: Verdana; font-size: 12px; color: rgb(17, 0, 0); line-height: 15px; "><pre class="php" style="margin-top: 0px; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 5px; padding-right: 5px; padding-bottom: 5px; padding-left: 5px; vertical-align: baseline; width: auto; clear: none; font-size: 12px; line-height: 1.333; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-color: rgb(206, 208, 211); border-right-color: rgb(206, 208, 211); border-bottom-color: rgb(206, 208, 211); border-left-color: rgb(206, 208, 211); border-top-style: dotted; border-right-style: dotted; border-bottom-style: dotted; border-left-style: dotted; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: rgb(244, 246, 246); font-family: monospace; background-position: initial initial; background-repeat: initial initial; ">
<span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(177, 177, 0); ">if</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">(</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(153, 0, 0); ">isset</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">(</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 136); ">$_GET</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">[</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 255); ">'debug'</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">]</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">)</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(51, 153, 51); ">&&</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 136); ">$_GET</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">[</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 255); ">'debug'</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">]</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(51, 153, 51); ">==</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 255); ">'debug'</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">)</span>
<span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(153, 0, 0); ">define</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">(</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 255); ">'WP_DEBUG'</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(51, 153, 51); ">,</span> <span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 0, 0); font-weight: bold; ">true</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(0, 153, 0); ">)</span><span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; vertical-align: baseline; color: rgb(51, 153, 51); ">;</span></pre>
</span></div></blockquote><div><br></div><div>Put this in wp-config.php, in place of the usual define('WP_DEBUG', true); call.</div><div><br></div><div>This is definitely going into my own install, so that I can use debug mode on my Theme review subdomain, without outputting tons of errors on my main site!</div>
<div><br></div><div>(p.s. note the caveat to change the second instance of 'debug' to something unique, for a bit of security-through-obscurity.)</div><div><br></div><div>Chip</div>