As part of our NYC NoSQL Fall '09 mini-conference, Bryan Fink of Basho Technologies was nice enough to give a short presentation of his company's riak product.
This is shaped by the Amazon Dynamo document, and provides a decentralized key-value store with map/reduce and HTTP/JSON queries making it ideal for web apps.
And of course, no SQL.
You can see the full slides from Bryan's talk including his comments at:
riak.basho.com/nyc-nosql/