slava @ rethink here. DB innovation moves slowly. It takes time for people to adjust to new technology, for new technology to adjust to market demands (DBs are fundamentally more difficult to develop than most other software, so it takes more time), and for existing large companies to adopt new technology. As a result, the NoSQL field is still evolving, and there hasn't been a product yet that really nails it. We hope Rethink will be it, but it will take a little bit of time for that to happen.

Either that, or we're all nuts :)

EDIT: ahh, Alex beat me to it!