I totally love Hotel Tonight Planner. I’ve gotten some amazing deals on hotel rooms when all the travel sites (Orbitz, Expedia, etc.) told me that everything was booked. I scored a $300/nt room in Ft. Lauderdale for $89/nt for three nights and, when that room was exhausted and I had to find another joint (Hotel Tonight lets you know how long the room is available for and, since it was a rather spur-of-the-moment trip, I was totally cool hotel-hopping), I got another great deal on another room for a couple of nights (plus free parking and free drink vouchers for the bar! Bonus!)