As I’ve explained in earlier pieces, 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 resources, and find it interesting to see which ones might be particularly “popular.”

I recently discovered that StumbleUpon, the popular web discovery site, published a list of The Most Stumbled Sites of 2009. That link will take you to the top three in various categories. You can see the complete list here.

In addition, if you want to see the top five StumbeUpon sites each week, you can read about them in The Independent.