I'm shopping for a new commuter and CX bikes are at the top of my list. They have the advantages of a road bike (light weight, drop bars), are a bit more heavy-duty (especially the wheels) and have room for fenders and larger tires. My last commuter was a low-end road bike ('07 Schwinn Le Tour GS which was not purchased with commuting in mind) which worked well but I was limited to 28mm tires as I wanted fenders. Had it not been totaled in an accident, it would still be in service but, as the insurance company will be funding a replacement, I will be buying a bike best suited for my commuting needs.