Yeah i've tried ice hash in amsterdam which is the same thing, its great stuff But can be very expensive depending on what strain it comes from. Think i paid 20 euro's for a gram of ak-47 ice hash! But it was 2 of the stongest joints i've ever had lol Check out http://www.cannabisculture.com/articles/4117.html for info on different hash extraction methods, water hash is down near the bottom.
An if you want info on loads of types of hash along with green take a look at www.smokersguide.com. Should keep you going for a bit!

Peace