While browsing through Time for information about Last.fm's nomination as a top 50 website, WebTwitcher discovered the top 5 worst sites to avoid. They are: eHarmony.com, evite.com, Meez.com, MySpace and Second Life. Which interestingly appeared in their top 50 sites last year.
Let WebTwitcher know if there are any others you'd like to add to the list.