I discovered Tiny Geocoder today. This site allows you to type in an address and it instantly converts the address to the exact latitude and longitude coordinates. This site is free and does not require you to register (no login/password to remember). A map is included in the results. It also gives you a tiny url so you can Twitter your results.
I think this site will be useful for traveling. Later this month, I will be joining some friends at 318 Cafe in Excelsior, Minnesota. I typed in the address for this cafe and got the GPS coordinates. Now I can simply enter them into my GPS and be guided right to the restaurant. Cool!