I use Hulu Plus. Its $7.99/month. It brings you NBC, ABC, and (most) Fox shows. There is no CBS.
One option that I will be doing shortly is building my own DVR. While it will be ~$500 (including Windows 7), I'll have a dual tuner set up. I figure its <5 months of what I was giving to Comcast. This would let me record my NCIS.