Unfortunately the iTouch doesn't have the onboard fluxgate compass or GPS receiver that my iPhone has, so as a navigation device it's limited.

I'm fond of iTopoMaps -- I have the quads I use downloaded to the device so I don't need a data connection to use my maps. It'll work on an iTouch, it just won't show you where you are.

I like the electronic version of the SAS Survival Handbook. Worth the money.

The WikiHow Emergency Survival Kit app covers things that the SAS Survival Handbook does not and is easier to navigate if you're looking something up that you need to know immediately.

Combating boredom is vital. I watch movies on the train and play games on my iPhone all the time. Ebooks also make me happy. My favorite ebook reader is Stanza, but eReaderPro is also very good. Google Books is good too.