MongoDB is one of the NoSQL databases. Here is an easy book[1] and interactive guide[2] to learn MongoDB. [1] http://openmymind.net/2011/3/28/The-Little-MongoDB-Book [2] http://www.mongly.com/ -- Regards, T.Shrinivasan My Life with GNU/Linux : http://goinggnu.wordpress.com Free/Open Source Jobs : http://fossjobs.in