This summer will be the first that we travel with an iPod Touch, too. I'm learning all the tricks with it now.
One of the most useful tricks is the "screen shot" feature (push the sleep button and home button at the same time) and it takes a photo of whatever is on your screen at that moment. So when you have a WiFi connection, you look up something that you know you will want to reference later, when you are away from WiFi, then tale a shot of it. It lands in your photos and you can easily look it up later.
I plan to use that function with the "Maps" app and I'll take a screen shot of each step of a driving trip. No need for a paper map anymore.
In the palm of your hand, you'll have music, photos, movies, games, maps, weather, email, the web, and more. It's amazing, really, to think that just 5 short years ago, most of that would not have been possible, or at best, very inconvenient.