Just putting out some feelers. Besides my full time design job, I also do contract design. I have just finished a PCB based on the ConnectOne - Wi2Wi. chipset for 802.11 communications. At my "real" job, I use Arduino for rapid prototyping and one offs. Anyways, I'm going to need 802.11 solution for a Ardino project. It will be interfaced to a Mega2560, so I thought I would reuse the design and change the form factor to a "shield".
I have attached a pic of one the prototype PCB's just for a look see.
The prototype is nothing more than ConnectOne's Secure Socket iWiFi with a PS and interface logic added. http://www.connectone.com/products.asp?did=73&pid=61
Pic:
The shield would be an interface for the module from ConnectOne and include:
Mega2560 form factor
3.3Volt power supply (maybe a 5.0V for the Mega)
3.3 to 5.0 volt level shifting for communication.
Headers for the Secure Socket iWiFi. (you buy your own from Mouser, ~$50
RS232 port for configuring the ConnectOne part off of the Mega via ConnectOne's tool.
Pass through headers for stacking the Mega2560.
various LED's and switches 
Any interest? If so, we'll work out the details later.
Thanks,
John