Liveplace.com has recently released a clip presenting their yet-to-be-launched online world, CitySpace. Check it out in the following video:

What is really great about this online world is that the environment it features can be accessed via a conventional browser and is fully rendered server-side, allowing relatively weak devices such as phones and PDAs to load the game without problems. The video you saw above was streamed on Treo 700 at 240kbps.