Monday evening, at a gathering called Campfire One, Google unveiled App Engine, a hosted web application platform that offers web developers free use of Google's mighty infrastructure and all the building blocks that Google uses for its own applications. Amusingly, it's as vendor lock-in and importable as anything Microsoft in its heyday ever dreamed up. That, however, didn't stop Google from immediately filling the 10,000 spaces it made available for App Engine's initial beta.