One of my favorite writers has always been Smash 137.
The dude is just flat out a beast and hearing from people who have painted with him they just pretty much shake their head when describing how good he is. His online sketch diary is a huge inspiration to anyone obsessed with letters.
Here are some my favorites from the 600 plus that he has posted:
Check out his page:
Smash 137 Dot Net
and his old page that is still up:
Smash Trash Dot Net