<a href="externalLink.aspx?l=http%3A%2F%2Fwww%2Epiratetheworld%2Ecom%2Fsignup%2Ephp%3Fref%3Dkjermzs" target="_blank">Pirate The World - Online Adventure Game</a>
This is a fun little browser based pirate game I found a while back. you have a certain amount of moves each day and you go around islands attacking other pirates. The cool thing about this you can actually "cash out" at the end of each month for a real money value that you can use towards purchasing games.
I hope posting this isn't against the forums rules, I thought I'd post it after I saw the Ogame thread on here of which I've been playing for about a month now.
PS: the link is an actual referral link.