For those of you interested in the details of last Sunday's Amazon S3 Availability issue you should read the detailed explanation posted at the AWS Status Dashboard. Root cause was single bit corruption of internal state messages that are distributed via Gossip techniques.
Looks like Amazon is poised to wipe PayPal's incompetence from the web. Also, check out pricing: for $1 transaction, you'd pay $0.06 vs. PayPal's $0.33. It even aggregates micropayments automatically so that you don't have to do that on the app level.