Way too many applications that I just have trouble justifying their existence!!! However, Travelr caught my eye. To me, it is an interesting way of organizing your travel photos. Should anyone be interested in viewing them, voila, it also shows exactly where on the globe you were.

One practical application of a mashup that Wikipedia explained that I thought was interesting. If I understood it correctly...combining a map of locations for real estate sellings. I tend to view the mls site on a regular basis and consider it a bonus to be given that information as well.