There is also a slightly cheaper alternative to the MAHA MH-C9000, which is sold under several brandnames: La Crosse BC/RS-700, Voltcraft IPC1L, Accupower IQ128 or Accucell BC-700

Also availible with a optional 12V DC car imput.

The Sanyo USB Charger also mentioned here, is indeed a nice compact (travel) charger.