Chicago's Restaurant Week officially ended yesterday. However, more than 60 area restaurants have decided to extend their three-course lunches ($22) and dinners ($33 and $44) by a day to a week or more. A couple have extended their offers indefinitely.
A list of participating restaurants can be found on Phil Vettel's blog: The Stew.
Please note, the restaurants are free to update and change these promotions at any time. So it's a good idea to contact them directly for details before hand.