The Top 10 list is a ubiqutious part of our culture these days and using the power of folksonomy, you can easily find some interesting web sites.  This is a list of sites that have been bookmarked using the tags "best", "top10" and "toread" on Delicious, a social bookmarking web site.  Fairly tech-heavy but there are some links that non-technies might find of interest there as well - Top 10 Presentations of all-time, Top 10 Underated Movies, etc.