[DocSavage]

The pay-as-you-go won't be enabled until sometime around the end of the year.

The quoted CPU pricing "$0.10 - $0.12 per CPU core-hour" is similar to Amazon EC2 small instance pricing ($0.10/hr), but it's probably not a straight comparison. AppEngine seems to charge by the sip, as might be expected from a compute utility, while web apps will probably require a minimum of 24x7 usage of an EC2 instance. So AppEngine should be less costly on the low-end.

Here's an interview with some AppEngine managers on the announcements tomorrow:

http://readwritetalk.com/2008/05/27/pete-koomen-paul-mcdonal...

[delano]

EC2 charges only for the time you use, rounded to the next hour. A small instance running for 6.1 hours costs $0.70 + bandwidth.

http://www.amazon.com/FAQ-EC2-AWS/b?ie=UTF8&node=2015910...

[briansmith]

My understanding is that EC2 charges for wall clock time. I heard a rumor that Google was going to charge only for the actual CPU time used. In other words, if your service is totally idle, Google will be free but EC2 will cost you $84 a month per server.