[hansgru]

> MongoDB vs. Cassandra

None. We use OrientDB http://www.orientdb.org/ (it supports more than one "storage" mode: http://nosql-database.org/ )

On the plus side, it's Java based (without native stuff), so it can run existing production machines where mongo can't be compiled (Sparc, HP, etc).

Another nice advantage is the support for SQL syntax, so for existing teams, the DB people won't feel left out :).