Or! Or! Or! The app for romance-sparking conventioneers who want to save a few bucks to blow on the minibar and exotic massage oils:

Here's how it works: At noon local time each day, HotelTonight lists three hotels at different levels of comfort (such as elegant or basic) in each destination that can be booked until 2 a.m. If rooms sell out at one location, HotelTonight adds a different hotel to the listings. First-timers get a $25 credit for using the app.