I periodically post “most popular” lists of websites (and books) that I think educators might find useful. Of course, there are a number of ways to gauge “popularity.” I just view these lists as opportunities to check-out some new sites, and find it interesting to see which ones might be particularly “popular.”
You might be interested in The Best Places To Find The Most Popular (& Useful) Resources For Educators –2010.
Today, I learned about another interesting place to find “popular” items — All Things Now lists the most shared content on Facebook.
It looks like it could be useful.