Fraud and Hoax Watch

evaluates the claims made by email chain letters.   It also provides tips for evaluating the accuracy and presentation of information.  Users may register for a free bi-monthly newsletter.

is part of about.com.  It covers a broad range of misinformation and urban legends.

is well designed and is easy to search.  It categorizes legends as true statements, false statements, statements of undetermined or ambiguous veracity, or legends of indeterminate origin.