Guessing the Gender of a Name

Ever wonder how to tell the gender of an unfamiliar first name? The PRSPCT-L listserve (for prospect researchers) had a discussion of resources for figuring this out and members provided the following suggestions:

http://www.wikihow.com/Find-the-Gender-of-a-Name
http://www.weddingvendors.com/baby-names/
http://www.gpeters.com/names/baby-names.php
http://www.behindthename.com