Darth_Daver on 24 February 2008
I really like www.tick-tech.net because it's my own website :)
but seriously, the ones i'm on the most are:
www.bbc.co.uk
www.ign.com
www.skysports.com
www.facebook.com
www.highdefdigest.com (although less now as the format war's over)
there's loads more but they're the main ones.