[theme-reviewers] Featured and Most Popular Themes

[Otto]

Featured Themes:
- Ordered randomly (notice that they shuffle when you reload the page).
- No set criteria. They're what the people who manage the site think
is cool or interesting.
- They change whenever somebody feels like changing it. No fixed pattern.

The Most Popular Themes are the most downloaded themes over the last X
days, where X is a number that I'm not going to tell you.

-Otto