Currently we are working on LevelDB support, source tree will be updated soon. Testing snapshot is quite unstable, but syncronizes well enough.

LevelDB minimizes memory usage and makes syncronization faster, but there is also some Proof-of-Stake related side effects. E.g. validation of PoS block requires additional LevelDB transactions. As the result, performance benefits are lower than it would be for pure PoW based system.

Experimental Win32 build with LevelDB storage:
http://sourceforge.net/projects/novacoin/files/experimental/novacoin-0.4.3-mingw32-4.2.1-sjlj-cross.zip/download

Reports are welcome.

If you wish to make your own build then you need “USE_LEVELDB=1” option.

UPDATE: merged into the main tree. Testers are welcome.
UPDATE2: memory leak found, thanks for the report