Good Los Angeles cafes to work at.
I've found the Groundwork and Caffe Etc (both in Hollywood on Cahuenga) to be quite conducive to work, as they had large glass windows to let lots of light in. While Insomnia is a very comfortable place to sit, the vibe just seemed to dim for me. Obviously you'll have the warm glow of your laptop screen to keep you company, but it still felt a little too living roomy.
Depends on your personality type, though. My brother loves the bohemian-looking coffee shops with lots of couches, whereas I don't.