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I know Twitter's just done the dirty with Cassandra, but it seems Cassandra is getting a massive PR boost this week, despite being one of the older (where old is 2008!) NoSQL systems.

Can anyone explain/posit an idea as to why MongoDB and CouchDB have been stealing the thunder for the past year rather than Cassandra? It just seems odd.

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Cassandra is by most accounts a pain to setup and administor. Mongo has good docs.

Its actually very easy to setup. Install and run ./bin/cassandra -f nothing like the troubles with HBase.

Administration is pretty hands off for most tasks. For instance you want three copies of each piece of data? Set the replication factor to 3. Other parts are difficult to "get" if you don't have an understanding of the code, my best advice is to make sure you approach Cassandra from a developer perspective. You can't treat it like a black box quite yet.

Not sure where you are getting your information from, but Cassandra is one of the easiest setups I've used. It couldn't be simpler. I do not have experience with MongoDB though.

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