For Buffy, I've only seen through the second season, though I've also seen one or two random other episodes from later seasons at the insistence of others. Seasons 1-3 are on Hulu (hey, 3 wasn't there last time I looked! Cool), so maybe they'll add more again. (HOW DO VIDEO GAMES PILE UP LIKE THAT?)

I have not read the manga. I loved the original anime and everyone says the manga is better, but I ... have not. It may be a lame excuse, but I don't want to have to keep paying for it because I can't afford the really long stories (Fruits Basket just ended and while I'm a bit sad, I am also relieved, since augh manga costs too much), and the libraries don't carry it. But that is good to consider! Because one day I will eventually get my hands on it!