Cassandra Explained: An Intro to the Cassandra Data Model

This happens to be an oldie but a goody. On the same topic, I might as well spread the wealth of links I've amassed for learning and understanding Cassandra:<p>Up and Running With Cassandra <a href="http://blog.evanweaver.com/articles/2009/07/06/up-and-running-with-cassandra/" rel="nofollow">http://blog.evanweaver.com/articles/2009/07/06/up-and-runnin...</a><p>Building A Small Cassandra Cluster <a href="http://posulliv.com/?p=149" rel="nofollow">http://posulliv.com/?p=149</a><p>Cassandra PHP CRUD Class (Pandra) <a href="http://github.com/mjpearson/Pandra" rel="nofollow">http://github.com/mjpearson/Pandra</a><p>Getting Started - CassandraWiki <a href="http://wiki.apache.org/cassandra/GettingStarted" rel="nofollow">http://wiki.apache.org/cassandra/GettingStarted</a><p>Cassandra In Action <a href="http://spyced.blogspot.com/2010/03/cassandra-in-action.html" rel="nofollow">http://spyced.blogspot.com/2010/03/cassandra-in-action.html</a>

Coincidentally, I came across this article on my own last weekend. Definitely a great read if you're trying to learn Cassandra, though it doesn't explain <i>why</i> you should learn it.<p>Does anyone know of a resource that clearly explains the advantages and disadvantages of the various RDBMS alternatives?