There's only three blogs that I check daily, so I'll start with them:
Mike Sterling's Progressive Ruin
There are many comics blogs that I read occasionally. Why is this the one I check daily? Maybe because I know it will be updated every day, but more because I like the content. Mike Sterling writes about comics conversationally without being geeky, and the behind-the-scenes views of a comic book store are fascinating... and also, I'm chalk!