FYI, a posting with slides from a presentation on MongoDB (I didn't go)
http://www.nyphp.org/PHP-Presentations/145_Recovering-Mongos-MongoDB-PHP

 From mongodb.org:

"MongoDB (from "humongous") is a scalable, high-performance, open 
source, schema-free, document-oriented database. Written in C++, MongoDB 
features: ..."

"MongoDB bridges the gap between key-value stores (which are fast and 
highly scalable) and traditional RDBMS systems (which provide structured 
schemas and powerful queries)."

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