I tried this out the other day and was quite happy seeing that I was getting a few bitcoin for free. It does not make you rich in bitcoins, but you do end up getting some for free. You pay .5 bitcoin (about $5 US with current rates), I got the .5 btc back though after abot a day waiting for the system to randomly pass out some free coin to me. Give it a shot if you like at the following address:
http://rand.bitcat.ch/?ref=103