Well it's a positive move in my book seeing that I've been there, done that and bought the T-Shirt.
The one major downside is that they're not opening up all the other ancillary components of the framework including bigTable. If they did this, then we might actually start to see an ecosystem of providers develop in the cloud.
I might actually find a cloud service that I'm happy with.
Stop dithering ... you're going to have to in the long run.