Plus PHP (via Quercus) would convert a lot of developers.
Edit: looks like it should!
http://code.google.com/appengine/docs/java/runtime.html
App Engine runs your Java web application using a Java 6 JVM in a safe "sandboxed" environemnt. App Engine invokes your app's servlet classes to handle requests and prepare responses in this environment.
Why was this downmodded so much? I don't get it. Wanting to have native PHP support seems like a perfectly reasonable wish.
[Edit: Now it seems out of context, but the parent was at -2 when I posted this]
Plus PHP (via Quercus) would convert a lot of developers.
Edit: looks like it should!
http://code.google.com/appengine/docs/java/runtime.html