A Useful Mashup
I've seen a lot of mashups that are neat-o, but not particularly useful. Riaan pointed me at his mashup of GMaps and hotel data, and he appears to have found a truly useful mashup application. The interface does need some work and could use a few enhancements; for example, a list of major landmarks so you could narrow down your search, but overall it's a great idea. Of course, the other part would be integrating into a full-service travel application, but with any luck, one of the biggies (Orbitz, Travelocity, Expedia) would pick this up.
Update: Riaan has a post up about this.