After a brief (okay, six month) hiatus, I'm continuing to work on my app engine app. One thing I'm noticing is that it appears that data access is considered pretty CPU intensive. I'm not sure if this is because they're abstracted IO and CPU to a higher level and just labeled EVERYTHING as CPU or if their method of getting to data actually uses more CPU than one would expect. I tend to think it's the former because there is no apparent measurement for IO.
--Begin shameless plug
In any event, check out my progress at http://findmysport.appspot.com