Here’s another comparison of little AVR-based boards:

From left to right:
- JeeNode – ATmega168/328, FTDI, wireless
- Boarduino – ATmega168/328, USB
- Stickduino – ATmega168, USB stick
- Teensy++ – AT90USB646, on-chip USB
- Teensy – AT90USB162, on-chip USB
- Baby Orangutan – ATmega328, motor drivers
Unfortunately, I forgot to show the RBBB (Real Bare Bones Board), and the new Strobit unit (also shown here) – they both deserve a place in this line-up.
These little boards are not entirely equivalent, but all of them are great for AVR-based fun DIY projects.
http://www.adafruit.com/blog/2009/05/22/one-chip-sized-arduino/
I’m using an Iduino with your RF12 library. Works fine. Size is about the same as the Boarduino.
How to obtain the JeeNode PCB?