I have been using GAE and find that it has some quirks as a web platform. It is basically a quirky JVM in the clouds.
VMForce should prove to be a much less quirky JVM. The Spring stack (Tomcat/tcServer, Spring, Groovy & Grails or Java & Roo) is mainstream JVM. I tried to run Grails, and Gaelyk, on GAE, but gave up when I realized how long it took to load a dynamic language after users hit the web site.
It seems pretty likely (but I have not verified) that VMforce will be optimized for Grails development. This is an exciting prospect.
The recent addition of RabbitMQ/AMQP looks like VMforce will be able to go toe-to-toe with Google's pubsubhubbub. Very interesting.
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