Hulu is a self-described "free online video service that offers hit TV shows including Family Guy, 30 Rock, NBA and the Daily Show with Jon Stewart, etc."
A huge fan of ABC and NBC.com, I am thrilled to find yet another site that provides my favorite TV episodes when I want to have time to watch them, and I can do it from my computer when I don't feel like going downstairs to watch TV. :-) I'm such a huge fan of not having to tie myself to a schedule to enjoy real people TV!
The site has very few commercials (much fewer than network sites), and you can also watch movies on it. (I'm afraid I've been too absorbed in catching up on Grey's and The Office to explore that option just yet.) So far, I have no complaints on the quality, either.
Ooooh! Yay! I just realized I can catch up on 24! Here I come, Jack....