This is good news.
I also note that Amazon has made the next logical step with SimpleDB - a web service for running queries on structured data in real time.
Apparently SimpleDB "requires no schema, automatically indexes your data and provides a simple API for storage and access." and "you organize your structured data into domains and can run queries across all of the data stored in a particular domain".
Though this is interesting, I would hardly consider it the most revolutionary or seriously disruptive idea, since Libapi (Zimki's predecessor) was doing this circa Dec'05. The next "disruptive" step would logically be an application framework to tie all the bits together.
Any real disruption won't occur until we get an open source environment and an ecosystem of providers e.g. a SaaS and OSS play.
There is still plenty of room for some company to "disrupt" Amazon's new world.