* Belkin Pre-N accesspoint/routers run embedded linux, but openwrt.org stuff isn't up to snuff yet.
* SMC Barricade G model SMCWBR14-G devices are cheap, and run uClinux, but nobody's giving up the source to it. Bleh. They support WDS and can turn off DHCP, so they will work fine for cheap wireless repeaters.
* Belkin Pre-N cards under linux require latest ndiswrappers, and require the driver for the Netgear WPNT511, available at http://kbserver.netgear.com/products/WPNT511.asp