Tiny Empires is a massively multiplayer game with a medieval theme that you play entirely on your HUD.
I'm cutting the price -- this week only! You can play unlimited for only $499L. Of course there is a free trial, so come get the trial version and see if you like it before you buy!
Here is ye olde link (SLExchange) so that you may get the free trial version, forsooth!
http://www.slexchange.com/modules.php?name=Marketplace&file=item&ItemID=288335
Another link on SLBoutique:
http://www.slboutique.com/index.php?p=buy&itemid=239226
Alternatively, you can just come to my shop in Kitster and pick up your trial there:
http://slurl.com/secondlife/Kitster/145/40/53/
Or, just search for Ultralite in Second Life!
Here's a pic of the game in action:
