Dr. Alfred J. Freddoso of Notre Dame, whose personal website is already a source of seemingly infinite learning, has embarked upon a new English translation of the Summa theologiae, which he hopes to publish with St. Augustine's Press before too, too long. In the interim he has taken to placing PDF versions of individual questions on-line as soon as he has them in "penultimate draft" form. As of this writing he has most of the Prima pars done, and chunks of the Prima secundae. Check it out, and don't forget his helpful commentaries, too.