What I know so far:
- the factory firmware is based on OpenWRT 7.09 (Kamikaze). No idea how heavily it's been modified.
- DD-WRT has a build running on it already here
- OpenWRT's supported devices page didn't list the WNR2000 at all, but the "legacy" page listed the wnr2000v1, which is a sligntly different model.
- The openwrt wiki lists it as being WIP, and There's a forum thread linked, but it's only for the wnr2000v1, with no mention I could find of the v3 in the thread
root@DD-WRT:~# cat /proc/cpuinfo system type : Atheros AR7241 rev 1.1 (0x0101)