Yes, Chef and Puppet are nice.. but take a while to get your head wrapped around their concepts and respective DSLs (sometimes REALLY unintuitive)
An exceptionally awesome and new kid on the block (& python based yay)
Saltstack - saltstack.org
Very new, but took me about 20 mins to get 3 machines setup and running.
Still lacks intuitive environments support (it has pillars, but i did say intuitive)