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"Growl for browsers." Sounds like a good startup pitch. Tough to monetize, perhaps (tiny ads?).

Boxcar is doing it for iPhones/iPads.

We're also doing it for every device imaginable. Just haven't launched the others yet. ;)

We do have a WebSockets API that OP could hit and write a Chrome extension against. E-mail me (jonathan@boxcar.io) if you'd like access to it.