this phone, with WiFi

[Ted Lemon]

Another option:

http://www.makezine.com/blog/archive/2006/08/ 
how_to_build_a_4_x_aa_usb_batt.html

or:

http://www.makezine.com/blog/archive/2006/05/ 
mintyboost_small_batterypowere.html

You can buy this second one as a kit for about $20.  You'd have to  
rewire it a bit to provide bus power, I suspect, but you don't have  
to figure anything else out, which is nice.   The nice thing about  
this is that chargers for AA NiMH batteries are easy to get at Radio  
Shack or Batteries Plus.

My inclination would be to pull the shroud off your USB WiFi dongle  
and make a single unit containing both the rechargeable batteries and  
the WiFi adapter, with a single USB connector coming out of it for  
the Neo.

Let us know if you build one of these - I will do the same.   :')