Atmel recently announced the release of their next generation of low power 8-bit MCUs. Promising to be pin compatible with previous ATmega family members, these “The Atmel mega168PB, mega88PB and mega48PB are available in 32-pin QFN and QFP packages with additional devices available later this year. All devices are sampling now. Production quantities for the mega168PB devices are available now while the mega88PB and ATmega48PB devices are available in February 2015.”
Atmel is making available a limited of Xplained Mini eval kits using the ATmega168 or ATmega328 available for $8.88 from the Atmel store.
The ATmega328 board’s user guide is available as a 16-page PDF.