I tend to watch some of the late night shows on DVR or, more likely, on YouTube weeks after the fact, but sometimes I try to ride the buzz of a 'live' event and stay up to watch some late night tv. This happens to be a good week on the Fallon Show (NBC):
Tues. (today) - Bon Iver
Wed. - Thurston Moore and Bob Mould
Fri. - Archers of Loaf !

I keep a bookmark of www.interbridge.com/lineups.html going so I can check when I think of it...
anyhoo, don't watch too much tv!