W - X List of Web 2.0, Social Media, Networking, Tagging, Sharing Sites

http://www.wayfaring.com/
http://www.web2.0validator.com/
http://www.web2list.com/
http://www.wetpaint.com/
http://www.widgetbox.com/
http://www.widgipedia.com/
http://www.wikihow.com/
http://www.wink.com/
http://www.wirefan.com/
http://www.wishlistr.com/
http://www.wists.com/
http://www.wiziq.com/
http://www.wobblog.com/
http://www.woofiles.com/
http://www.workfriendly.net/
http://www.xanga.com/
http://www.xboxkicks.com/
http://www.xfruits.com/
http://www.xing.com/