When does the new season of shows begin?

Other than the Olympics, which I didn't watch with a lot of fervor, there isn't a lot of programming on TV that I care to watch.  So I've been haunting my local Blockbuster (when they greet you by name when you walk in, you know you're a regular.)  Still, when's the new crop of shows due out?  Anything look interesting?

I'll be glad when my muse gets back from vacation.