So here’s the idea for supercharging your free AppEngine quotas: 1) switch you app to the paid model by enabling billing, 2) enter the minimum daily budget ($1), and 3) distribute the budget over resources you are 100% sure will not consume their free quota (e.g. if you have a stateless app which doesn’t use the database, put the whole $1 in the stored data quota). Since you put your budget on resources which won’t consume the entire free quota and since AppEngine doesn’t charge you anything if the app doesn’t step over the free quota – you are essentially getting a better free quota." - Ivan Zuzak

"EDIT (Sept 5 2009): Yesterday, a week after my original post, Google released AppEngine SDK 1.2.5 which includes a major feature a lot of developers have been waiting for – XMPP support. What’s interesting and relevant for this post is that XMPP has it’s own quotas for the number of API calls, data sent, recipients messaged and invitations sent, and – none of these quotas are marked as billable. Therefore, using the recipe for supercharging your free quota will also get you a significant boost in your XMPP quotas (657k -> 46000k API calls, 657k -> 46000k recipients messaged and 1k -> 100k invitations sent). Pretty cool!" - Ivan Zuzak