Congrats on the launch. I'm curious how your "popular" tab works.
If it is simply sorted by votes with no time-component then your going to have the same "self-fulfilling prophecy" problem that Stack Overflow had when they first launched.
Right now the popular tab sorts things based on the votes for the article, and also the votes for the items within the article. So an article with good items can rank higher than an article with more votes, but no items.
Right now there isn't any time-component to the popular articles. I was thinking of having sub-tabs for "popular this week", "popular this month", and "popular all time", and then having the default be "popular this month".
If it is simply sorted by votes with no time-component then your going to have the same "self-fulfilling prophecy" problem that Stack Overflow had when they first launched.