Adding to the list for Chicago:

Chicago Diner (www.veggiediner.com) - One of Chicago's most well-known strictly vegetarian restaurant, they have a huge menu and always serve daily specials, including different soups and entrees. Located on Halsted in Boystown, near Wrigleyville.

Karyn's Raw and Karyn's Cooked (www.karynraw.com) - Two different locations, one in Old Town (Raw) and one in River North (Cooked). Karyn's Raw as the name suggests only serves a raw food menu, while the Karyn's Cooked location is a more traditional vegetarian restaurant with all kinds of dishes. I prefer Karyn's Cooked for the soups, salads, sandwiches and great entrees. Both locations have very modern decor and the staff are excellent.

Blind Faith Cafe (www.blindfaithcafe.com) - Not located in Chicago, but just north of the city up in Evanston. An Evanston institution, serving vegetarian only cuisine for many years, including breakfast, lunch and dinner. They also operate a bakery onsite and have great vegan desserts.