I don't really support advertising other sites, but I wanted to point all of you towards The Dungeon Dozen . Jason Sholtis is posting new random tables almost every day. There are around 200 of them there now. Many of them are very good. I actually hope he makes a book collecting them and publishes it (then again, maybe he has and I just don't know about it).
In any case, if you run any type of fantasy game at all, you owe it to yourself to spend some time reading that blog. If you don't come away with dozens of cool plot ideas, I will be very surprised.