I've done it a few times and found some pretty cool stuff. One geocache even had a 20 euro bill in it with a note that said "take me". I usually put some coins and keychains in myself.
The best thing about it is that it's really something you can do all over the world. I have seen some very distant locations on geocaching.com
That’s cool!
Yes, I agree it is awesome that you can do it practically anywhere. Sometimes I fit in a cache or two when I travel with work.