You mean other than KH, the Yarn Harlot's blog and Grumperina's blog?
Are you a tv fan? If so, TelevisionWithoutPity
can be a good time waster--read recaps of your favorite shows. Their forums are a wee bit nutty though.
I sometimes google Miss Manners and get sucked into reading all kinds of strange advice columns.
Some of the free games links on sites like msn.com, etc. Youtube...
Can you tell I have a lot of free time at work?