Life changing Self-help blogs:
Changing human nature, one human at a time (dirtSimple.org) - You can find lots of cool articles here.
Personal Development - The Urban Monk - The best spiritual blog that I know of.
Not life changing, but totally HILARIOUS sites that I had to share:
Bash.org - Funny quotes
Xkcd - Cool webcomic
And a few more helpful sites:
HowStuffWorks - Learn how Everything Works! - If you like to learn how stuff works.
Mobile-review.com - Lots of well written, detailed articles about mobile phones.