You guys should try out MojiKan! Great virtual pet/world game with a real economy you can make money off of (the currency transfers directly to american dollars)!!
This is an mmorpg definitely retro slant (think Ultima 3/4 from the 80s and 90s). You can team up with other players to slay the evil hordes running amok ... or other players in other parties. Player cooperation is key to survival. You can use the magic system to keep yourself alive (heal) and fry others. Also, use armor and weapons to help with the general carnage.
Did anybody mention Caesary on R2games?
Many of our colleagues are playing Caesary in our office, and we built a Alliance to protect our cities and get resources from wildness. caesary.r2games.com, a good choice of free 2 play browser game.
Its a space game but you do alot of things and its very realist, you can design your own ship, buy tecnologies or change it with other players, intercept fleets on the fly, conquer planets..and much more.
Voyage Legends, http://www.voyagelegends.com is a thrilling MMO RTS game in which an entire world is up for the taking.
Having just discovered the science of sailing, adventurers are eager to explore the lush world of Tiberia. Build your own fleet of vessels and set sail to discover ports with different commodities for trade.
Players can build up their power by making successful trades and earning gold. Should you be powerful enough, you can even manipulate and dominate the economy, in effect taking control of Tiberia!
But it is not that easy. Every trade must be made by ship, and on the high seas, terror rules! You will encounter powerful computer-controlled enemies that will rob your vessels of their precious cargo. But quick thinking and a deft response can save the day, and a daring move may even turn the tides of battle for a spectacular victory!
Dominate the economy to become the most powerful player
Explore the many ports scattered throughout Tiberia and plan your trades wisely to reap the rewards and trade your way up to power.
Choose from three distinct factions
Make your fortune as the heroic Marines, the marauding Pirates or the shrewd Merchants.
Earn faction-wide bonuses Fight together with your faction-mates to rule Tiberia, and grow in power together.
Build your own fleet of vessels
Choose from four different classes of ships, and outfit them with different ammo types for powerful battle effects.
Fight thrilling battles on the high seas
Make a bold move to turn the tables, but should your gambit fail, you lose.
Customise your in-game avatar
Dress your virtual self up anyway you want.
Who Dares Win?
The pirates are coming for Tiberia. Who will rise up to stop them?
Join our facebook campaign to save Tiberia. Like our page, and be rewarded with a Bonanza Global Explorer premium account worth USD$10 once we gather 500,000 Likes.
Earn cash bonuses
Recruit your friends to join your quest of saving Tiberia. All holders of Bonanza Global premium accounts automatically qualify for our rewarding referral programme.
Earn up to 50% bonus in cash per player when you refer players under your unique ID. Unlike other programmes, we give you cash rewards which you can withdraw out of your account!*