I havent done the main quest in quite some time but I have been doing a lot of stuff with the Thieves guild. I just became a Nightingale myself and that armor is super badass looking. The guild has been a ton of fun too and I am officially addicted to this game. I generally never really play a game for more than an hour at a time but I played for about 3 hours today and the time just disappeared.
^A Bonekrusher production^