PerDiem FY09 is a cool little application that provides quick look-up for standard per Diem rates as set by the U.S. government. If you have worked for the U.S. government in the past, you are probably familiar with the concept. A per diem is an allowance for lodging, meals, and incidental expenses. There are some private companies that use the same concept, but if you work for the government, you are all set.
PerDiem 09 is completely updated with the new 2009 continental U.S. rates. It also supports foreign per Diems (as well as rates for Hawaii and Alaska). You can also use the trip calculator to quickly calculate the overall cost of a trip. The GPS service allows you to see the rates near you which is helpful. The application is very useful if you work for the government and want to keep track of things with your travels.