The Contacts app is just a simple database, so feel free to store any kind of text information in it, whether it's information about your stamp collection or a list of celebrities you'd like to meet.

You can use the iPad to store emergency contact information, your software serial numbers, or just the hotel room numbers of your own room and those of your co-workers during your next business trip. Now when you need to reinstall a program or find the right room, just look in the Contacts app on your iPad.