Found very nice ROM kitchen on android.modaco.com, cooked myself a ROM without Office and twitter support. Tried to remove FaceBook as well, but this broke sync somehow, and I had to put it back.

Reflashing new images it kind of fun. Though, I would really advise against reflashing over USB — this might easily break your phone. Please, copy new ROM to SD card and reflash from the card.

ROM kitchen access costs about $10 a year, and pre-baked images are available for free.