I've been posting regularly on the sketchblog Omega Sketch for about a year now. Here are some of my favorites of the topics I've done. Thought I'd post them for posterity.
The blog is on hiatus now, but we'll be back. Check it out at OmegaSketch.blogspot.com and look at what the other guys did. There's a lot of talent on that blog and I'm proud to be a part of it.