Hotel Tonight lets you stay warm during the Midwest blizzard with iPhone room reservations

Last week, we wrote about iPhone hotel app “Hotel Tonight”. When we first mentioned it, hotels could only be booked in New York, San Francisco and Hollywood. Just in time for the big Blizzard of ’11, Hotel Tonight has added Chicago, Boston and Washington DC.

Like the other cities, these new options let you pick a hotel room for tonight, and results display several price categories.

For tonight in Chicago (and our upcoming 22 inches of snow), you can spend the night for as little as $59.

Best of all, sign up and book a room, and you’ll get $25 off your first reservation. Invite friends from within the app, and you can earn an additional $25 each time one of them makes a reservation.

The app is free, and is available in the iTunes App Store.