Just got a couple of atheros based cards from solwise.co.uk and they work brilliantly. No problems installing robix onto some old hardware so now I have two working nodes. (One mini-itx, one old AMD Duron)
Have you been building this using the openwrt buildroot? I've messed with this quite a lot in the past for all the wrt54g's that I've got and done a fair bit of customisation.
If so, was it the latest release or SVN, and can you post the .config file? I'd love to have a mess around and see if I can get nodogsplash working.