Grails & App Engine is just not there yet
Just a quick follow up to my previous post; I've unsuccessfully tried to get the 'Hello, World' application running on App Engine. The java script pop-up never works and I run into timeout's far too frequently once deployed. There also doesn't seem to be much in the way of support for this combination yet.
For those interested, there was a brief mention of the problem during a fireside chat at Google IO. Here's the wave which summarizes the Q/A. If you haven't yet, I highly recommend the Google IO videos.