Electronic Arts is opening up its The Sims Online game to free membership, renaming it into EA-Land, and introducing a number of changes, the following one being the most interesting:
"In EA-Land, game data is available to the internet through web services so users can add gadgets to their Google pages to monitor the state of data they care about in game, for example, if a store is open." (source)
There will be user-created assets and an economy, of course. And, likely, ads.