What are the best apps for an ipod touch?

I just got an itouch, and am looking to load it up! I have the basics (remote, facebook, flickr, fluther, nytimes, etc) but am curious if there are other apps that make your life easier. For example, on the plane last night I was so glad I had a flashlight app! It really worked.
I’d be specifically interested in any Paris/travel/voip/food apps you can recommend.