I'd been planning to use my road bike as a commuter indefinitely (I use it to commute now), but after looking on craigslist and seeing a bunch of totally serviceable old road bikes for under $200, I'm thinking I'll just buy a beater/commuter for riding to work. I realized I don't want or need to put all that wear and tear on my nice bike, and I can afford a couple hundred bucks to avoid it.