I keep forgetting to post about the cab company I've been using when I visit Mary Anne.
If you ever find yourself visiting Oak Park, IL, and you need a cab, I strongly recommend Red Cab.
They know the area well. They're friendly. They're fast. If you arrive at O'Hare and call them to come pick you up, they'll get there quickly and they cost significantly less than getting a taxi at the taxi stand. You can make a reservation online, though I haven't tried that.
My taxi experiences in the Chicago area with other cab companies have been mixed, but my half a dozen Red Cab experiences so far have all been excellent.