259.32 are the latest ones that I know of.
I see, says the blind man, gracias. IMO, Nvidia is sort of hiding the beta's in its driver web applet. Using that , I can't get it to show any beta's. I did a search for the specific driver revision, good old guru3d always mirrors the latest. I forgot some of these things, using ATI for a while.
Dell Releases NVIDIA GeForce Forceware 259.32 Drivers for Windows 7/Vistahttp://www.downloadatoz.com/driver/articles/dell-releases-nvidia-geforce-forceware-259-32-drivers-for-windows-7-vista.html