More an more devices are ready for the Microsoft TCP/IP stack that is available with the .NET Micro Framework version 2.5 introduced at the EmbeddedWorld2008 in Nuremberg.
GHI Electronics  have updated their firmware. Now their Embedded Master Module  supports DHCP and Debugging over Ethernet using the new TCP/IP stack. Bluetooth support is not yet supported, but you can plug-in a USB Bluetooth dongle and send files over Bluetooth. Embedded Master SDK is updated, too, and includes source code of the demo show in the new video .
Device Solutions  have published a new firmware release  yesterday that offers Ethernet. The release includes the new stack and a driver for the Microchip ENC28J60 Ethernet controller. Note that this version is an evaluation version  which will only run for 30 continuous days. There will be a Ethernet add-on board  available in May 2008. Download and debug of application is still setup to use USB.
Digi Connect ME  added a own TCP/IP stack with the older version 2.0 already. Until now I didn't get any news if they will offer a firmware upgrade for 2.5. Download and debug is running over Ethernet, USB and serial port.