I guess that I need to be patient :-)
I have been pretty much into Amazon's Web Services (EC2, S3, etc.) but I have also been eagerly looking forward to trying Java for Google App Engine on a Java project.
I remember it taking a few weeks to get an original App Engine invite, so I may not have to wait too long.
Update: I received an invitation to the beta program 5 hours after I wrote this original blog entry :-)