Lately, I have been so curious about alternatives to relational databases. Deeping a little bit exist a lot of interest about topics related with it.

The most important that I have found recently is the NoSQL conference, with lot of talks and information about Voldemort, Cassandra, CouchDB, and so on.

You can find some notes about that here.

I'm still suspicous about all this technologies, specially because it implies a hard change in the way to model and consume data, moreover when SQL and RDMBs are very valid nowadays, and (for sure) they have a big future, but they offer a lot of advantages that you have to know in order to take advantage if you have the chance.

Update:

A great post about this topics: Should you go Beyond Relational Databases?