Check Out FoundationDB Beta
Today, FoundationDB announced the availability of their "ACID compliant, high-performance NoSQL database platform." According to the press release, this new NoSQL solution addresses the inability of many first-generation NoSQL databases to support ACID transactions.
Here's a clip of the press release - you can check out FoundationDB by heading to the homepage, linked below.
FoundationDB scales to support millions of fully-transactional operations per second on a distributed cluster of commodity servers. FoundationDB is able to support a diverse set of applications and data models through simple “layers” which map different data models onto FoundationDB’s ordered keys and values.