With the new image-based-install method, I don't see how they could possibly do a "repair install". Another reason why I don't much like Vista. I do understand the trade-offs involved. The image-based-install is quite a bit faster -- can you imagine how long an old fashioned XP-type install would take? The X86 DVD of Vista is right around 2.6 gig, which would make it around 4 or 5 times larger than XP. If XP takes 39 minutes to install, would Vista take (4 x 39 = 156 minutes) to install? I shudder at the very thought!
So perhaps Microsoft could make available, possibly through MSDN, an alternate installer which would allow for repair installs? I have performed repair installs of XP at least 150 to 200 times, saving my customers countless hours of effort reinstalling their software and reloading their data.