@LadySuppenhuhn

Yes, if you find something in a cache that you like you can take it out IF you have something of equal value to put back into it.
I've known it for a couple of years too but I always thought it's some really special thing because that's what it sounded like in that docu that I saw on tv.  I read about it online again after someone said that Joscha and Ca looked for caches when we were in Buesum.
Of course it's easier with phones and things but Ian and I want to try it only with map and compass some day :)

I heared of it two or three years ago. Ecki and me found it very interesting but never tried it. I think now it's easier with an iphone or mobile phone with gps. When we heard of it, you had to use the pc and a map, as you said. Now you can do it more spontaneously.

Is it still common do change the treasure?

It is great, yes :)
Newer mobile phones have GPS too, so maybe you can do it anyway :)
And also, you can get the coordinates from the website, put them into googlemaps or something, print a close-up and then go out with map and compass :D (maybe drive and park somewhere near hehe)
I can find 28 caches in Panama when I search for it on the website, maybe there are even more, just not mentioned with the country in the details.

Sounds AWESOME!!! as soon as im able to spare 250+ bucks for a GPS ill give it a try. I wonder if there are any caches in panama.