Every once in awhile, I'll look through them and try to emulate something that is within my reach.
Here's a few recent ones:
http://dustincurtis.com/press_on.html
http://nerdcommunications.com/
http://www.thecleanestline.com/
http://letteringjs.com/
I started learning Photoshop & Illustrator about a week ago. Youtube is great for tutorials on specific things such as tool usage, colors.
Just found this one for Illustrator: http://www.ndesign-studio.com/tutorials
Fonts are also quite important to catch people's eye. I'm dabbling in the free stuff now, but I think TypeKit is also quite nice.
http://code.google.com/webfonts