Hulu has been pretty awesome so far. My only complaints are the resolution could be upped a bit and I can't really watch it in full-screen mode on a second monitor. Everytime I click on the other screen it instantly shrinks down the size. My best solution has been popping out the video and stretching it myself.
Yeah, I have to say I'm pretty impressed. For something that just launched, it works pretty well, and most of the complaints I have are "it would be nice" kind of things, not "they need to fix this or I'm never using it" issues. Fact is, I'll actually use this. For weekly TV, it's faster and more convenient than torrents, and for most TV shit, I don't really care so much about resolution as long as it looks passably decent.
I was afraid they were going to half ass this, but it seems to be turning out really well.