What makes Cassandra (and NoSQL in general) a better solution to an RDBMS?

Question

Well, NoSQL is a buzzword right now so I\'ve been looking into it. I\'m yet to get my head around ColumnFamilies and SuperColumns, etc... But I have been looking at how the data

Answer 1

I guess what I'm asking is "when should I choose NoSQL over RDBMS?"

[Caveat: I've never read about NoSQL before]

According to Wikipedia, NoSQL isn't good at joins: which implies (to me) no referential integrity and no normalization.