Hi,
any plans to add a 6lowpan module to the store ? (6lowpan = IPv6 for low power sensor nets).
e.g. the Atmel zigbits (http://www.atmel.com/products/zigbee/zigbit.asp?family_id=676) look like nice toys to play with, and not too expensive (23 USD each at digikey and only 12 Euro ( < 18 USD ) at strato.de) However, they only come in SMD 
Might be a nice addon to arduino, or a platform in itself (it comes with a buildin atmel 1280P).
I am more than happy to help out with the software side of things, as long as I can get my hands on the hardware 
Cheers,
Hans