A GUI for a stack that supports DHCP and Zero conf from the get-go? Surely most of the people nowadays have some modem/router thingy that supports DHCP.
Some impressive speeds but like others have mentioned a 1200 + PCMCIA card would be of interest to a greater crowd.
A legal TCP/IP stack that support autoconfiguration (fire and forget style), faster that the rest and for an affordable price? Hell yes!
And how's the memory footprint?