How to watch the 2012 Olympics after cutting the cable

I'm paying too much for cable TV that I don't watch, and I am fortunate to have good broadband internet (both from Comcast in the US). There are only a few events my family and I care enough about seeing immediately on TV. The Tour de France and major league baseball are both usually available via internet subscription services. But what about the 2012 Olympics? [more inside]
posted by Songdog on Jan 2, 2012 - 12 answers