Favorite Travel apps?

[MattHurst]

My iPhone is basically my lifeline while I'm traveling, and I like to have all the information I need (just in case). I'm getting ready for another big trip and wanted to refresh my iPhone apps before I leave.
To give you a good idea of what I'm looking for, here are a a few on my favores i like to use on the road:

LonelyPlanet - This app brings together all of the data from other travelers into really useful info, so I can use it while I'm out. Of course it's no substitute for these forums...
Google Maps - (self-explanatory)
Doc Keeper - Keeps safe copies of all my travel documents, including my passport and frequent flyer info, with me just in case I lose anything
TripIt - Helps me keep a working itinerary, and shares it with my friends+collegaues

What are some of your favorite iPhone apps to use when you're traveling?