http://www.airbuccaneers.com/
The game is in open alpha at the moment. You can sign up and play in it for free.
some videos and screenshots of the game
http://www.ludocraft.com/games/airbuccaneers/media/
Its rough aroudn the edges but it's a really fun game.
From the site
"Imagine…
A world where hot air balloons rule the skies and battles rage among the clouds. A world locked in eternal warfare among its inhabitants. A world where one fighter counts for nothing but a few can bring down an entire enemy fleet by working together in perfect harmony. A world where Buccaneers and Vikings have taken to the skies and wage war for its ruling rights. This is the world of AirBuccaneers. Take yourself there and give yourself to the sky.
What is it really about?
Hot Air Balloons
Take to the skies with any of the multiple hot air balloons available and engage your enemies in a beautiful air ballet of death and destruction.
Teamwork and Co-operation
You’ll soon notice that battles are not won alone. You can do only so much on your own. Someone has to steer the balloon and using the cannon takes three: one to load it, one to aim and one to light the fuse. And while your team is trying to drop the enemy’s balloon, someone has to try and block their attacks.
Tactical Aerial Warfare
Think before you act! Balloons move at constant speed and you can only affect their flying altitude and direction. Cannonballs are affected by the rules of physics and cannons are slow to operate. This means that nerves of steel and a tactical mindset will help your team achieve greatness. Running around like a headless chicken will just get everyone killed.
Character development
Gain experience points as you shoot your enemies down from the sky. Spend the experience points on developing your character in different skills and become the ultimate balloon-popping aerial warfare specialist!
Plenty of booty!
Steal your enemies’ riches and buy more epic gear so you can DO IT ALL AGAIN!
Never-ending War
A war has raged for centuries between the factions of the world of AirBuccaneers and there’s no end in sight. So gear up and join the battle! Conflicts all over the world map change the balance of war and ultimately decide whose name will be remembered in the next era!
Buccaneers!
Join the ranks of the Buccaneers, ye scallywag, and ye shall be soaked in grog and gold and wenches!
Vikings!
Fight with the Vikings and you are sure to receive riches and honour! It is a life worth living while waiting to pass into the halls of Valhalla!
Technical
AirBuccaneers HD is developed on Unity for Windows computers. Possibility of a Mac version is currently being investigated.
"
