U - V List of Web 2.0, Social Media, Networking, Tagging, Sharing Sites

http://www.unalog.com/
http://www.upto11.net/
http://www.urlex.info/
http://www.ustream.tv/
http://www.uvouch.com/
http://www.uxmag.com/
http://www.vennt.net/
http://www.video.google.com/
http://www.videojug.com/
http://www.view.nowpublic.com/
http://www.virb.com/
http://www.vitalist.com/
http://www.vmix.com/
http://www.vox.com/
http://www.vsocial.com/
http://www.vuvox.com/