I watch a lot of SC2(Proleague/GSL whenever able) and most major Quake tourneys that come up. Lately I have been putting on QLranks every day and watching that when nothing else is on(it streams 24/7).
I also watch sf4/marvel, speedrunners(mostly Siglemic) and a little bit of CS:GO. Just about any of the major competitive games I enjoy watching a lot.