Ohh if Seeedstudio wants to know my need, here it is

And i think my need is the need of many persons:
Aim is to have the smallest piece of arduino compatible (like the Pro mini) with clock at 16MHz to have NewSoftSerial, with the smallest power needed (3.3V) and the smallest piece of xbee connected to it easily
Or even better, to have the smallest piece of arduino capable of 2 uarts, 1 isn't really enough
Some kind of a sanguino mini pro in fact (644p is quite interesting compared to a 328p)
And of course with having the lowest energy consumption in order, in the long run, to have a wireless small piece that can send small amount of data from time to time for years
By the way I've seen in your shop
http://www.nkcelectronics.com/xbee-shield-remixed.html, it's surely what i'm looking for...
But this shield needs 3.3V or 5V ?
Because i've bought Xbee module from libellium but this shield is sooo big, I really don't understand why... (it connects on 5V provided by ICSP)
Cheers