The shows I totally love are: Fraiser, The Simpsons, ER, and for the moment I really like the show Scrubs
(its so stupid I can't help but laugh!). Oh, and my newest little addiction is Felicity even though I won't tell anyone who knows me.
If none of these shows are on, the tv is almost always on the Discovery Channels, TLC, the History Channel, or the Cartoon Network. Surgery always makes for good background noise when I'm doing homework.
Other then the shows I listed above, I usually don't end up watching much though - I just leave it when I'm busy with something else or about to go to sleep.