If you're looking for a Vegetarian (Vegan) restaurant, I had a good experience at Karyn's Cooked. My husband's been there a bunch of times (without me) and loves it. I'm not really a vegan-kinda gal, but everything we had was great and our waitress (Karyn's daughter?) gave us give advice on what to order. It's fairly casual, but definitely eclectic.
I also second Vie, if you can make it out to Western Springs. (It's a few blocks from the Metra stop.) Vie is definitely more of a "special occasion" type of restaurant, but they're friendly enough to make you feel comfortable. They have several vegetarian options on their menu. I've been there a few times and have never been disappointed.
Karyn's Cooked -
website
738 N Wells St
Chicago, IL
312-587-1050
Vie -
website
4471 Lawn Ave
Western Springs, IL
708-246-2082
-- Nora --
"Great food is like great sex. The more you have the more you want." ~Gael Greene