The new Tenergy TN160 battery charger is a god-send for strobists and battery hungry mobile devices that run on AA or AAA NiMH or NiCd batteries. It features 12 independent charging bays which allow users to charge anywhere from 1 to 12 batteries of the NiMH / NiCd variety. (Most chargers charge them in pairs, and don’t monitor batteries individually for maximum charge.)
The The Tenergy TN160 12-Bay AA/AAA NIMH/NICD LCD Smart Battery Charger is a great deal for around $30 USD. I recommend getting some Sanyo Eneloop batteries to go with your charger.