I'll be getting some free time over the next few weeks and I intend to put together a series of Cassandra Cheat Sheets. I've been wanting to for a while but haven't gotten round to it, so the following list are the individual sheets which target specific things relating to Cassandra.
Cassandra Query Language
Cassandra Thrift API
I'll add more as I get time in pdf,html and doc format... The first cheat sheet is already being written.