Plurk Open Source - LightCloud - Distributed and persistent key value database
http://opensource.plurk.com/LightCloud/

aid, here is what it takes to do 10.000 gets and sets:

Tokyo Cabinet is a trove of hidden of gems, the more you learn about it, the more you will appreciate the design and technical decisions behind it. By database standards it is a young project (started in 2007), but since it is a successor to the QDBM project developed by Hirabayashi-san (2000-2007), we could make the argument that it has been, in fact, nine years in the making.