App Engine Manager for the iPhone 3G and iPod touch.
Want to manage your Google App Engine applications from your iPhone? There's an app for that...
The App Engine Manger application allows you to to monitor the status of Google App Engine in real time, estimate your monthly costs based on your current usage levels, then lets you estimate how much a sudden usage spike could cost.
It also allows you to look at the performance of each of your applications individually and examine requests per second, upload and download bandwidth and CPU.