Spotted in Planet Squeak:

Lautaro Fernández announcedthe first beta version of Meteoroid, a Comet-based framework running on top of Seaside. It allows you to create "live" web applicationin a few steps - you can trigger changes to connected web browsers by using an observer-like mechanism. Each time the model changes, an announcement is triggered and data being pushed from the server to a special div in the browser.

He's got a packaged download based on the vwnc image, and a screencast that shows you how to get the latest installed. Looks pretty cool.

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