Well I have it working , but not with the twinview PCI card as my motherboard simply refused to boot with that card alone, forcing me to use a crap 4MB matrox as the second card.. ah well it works
thing is, I use an XDM login, hence no .xinitrc, but a .xprofile instead, I'm not sure whats going on exactly but if I do a startx I get two desktops with windowmaker whereas with fluxbox its one, but if I do a normal XDM login my first screen is fully working with the proper fluxbox settings etc, but my second screen is a seperate flux session that doesnt have my settings enabled? bay?
twinview would have been better and easier, gl on both screens, same card, no differences in colour or refresh (one is 1280, the other 1024

)
I'm not sure I've enabled xinerama properly as I can move the mouse from one screen to another , but not individual windows? strange? I can actually create them on their own desktops however, just not move them from screen to screen, shame I guess, as obviously each one is its own xsession
twinview would be a single one

bah