MySQL Cluster continues to be ahead of the game, but we don't always hear about it as Cluster developers are either too busy or too modest.
Oracle announced Exadata last week. It provides extremely high-performance disk access and runs software on the storage servers to perform selection and projection at the storage server. Oracle has discovered the value of condition pushdown. It is only a matter of time before they figure out the value of batch key access and query fragment evaluation. I wonder if you can buy the Exadata hardware without Oracle software? And I wonder when MySQL will use Cluster as the basis for a data warehouse server.
Mikael Ronstrom described work in progress to support multi-threaded Cluster servers. This has many things in common with H-Store which is a radically different design for a DBMS to scale on multi-core architectures. Well, it is different when you don't consider Cluster.