It feels like I've started the Main Quest a million of times, though I've only beaten it once. And I lost that character, whom I had beaten almost the complete game with... Then I always get so annoyed by doing all of it over again, so I haven't brought myself to doing it yet. Though I loved the final part, and that's why I want to beat it again, so I can watch it.
But I have beaten most of the guilds a few times, and the Shivering Isles. Also the knights of the nines have been beaten once or twice, and I think I've done almost all of the quests. I even ran around killing everyone once...
Though I haven't really played as a very powerful vampire yet, but I'm working on it.

I no longer use this acoount since I can't do anything with it. New username: Saquira