Some of the things that I find worthwhile:
- Lift-Run-Bang : Paul Carter's site. He's got a great outlook on strength training and life in general.
- Scott Lowe : Scott's technology blog. This guy knows enterprise infrastructure.
- Paul Graham : Paul's blog. Startup expert, hacker, and all-around wizard.
- Reddit : If you don't browse this already...well, maybe you shouldn't start.
- Penny Arcade : The best webcomic on the internet. Mostly about gaming and fatherhood.
- XKCD : The second-best webcomic on the internet. About romance, sarcasm, math, and language.