Gluten free does help a lot of people who have inflammation issues. I don't know anything about colitis, but since most things that end in itis seem to have an inflammation component, yes, it would probably help you. I'd strongly recommend Brenden Braziers book Thrive, the diet one, as most of the recipes in there are gluten free. It's a vegan diet book, and I reckon that's not your goal, but that book would probably be a good jumping off point for you.
http://www.brendanbrazier.com/book/index.html
Sorry I can't link that for you, I'm on my cell phone.
Thanks. Yeah UC is an inflammatory bowel disease...not as bad as Crones but sucks non the less.