A nice little compare-and-contrast essay of various options to the relational database. The author is impressed by Cassandra, for certain applications.
My Thoughts on NoSQL – Die in a Fire – Eric Florenzano’s Blog
Cassandra has no single points of failure, and can scale from one machine to several thousands of machines clustered in different data centers. It has no central master, so any data can be written to any of the nodes in the cluster, and can be read likewise from any other node in the cluster.
