In fact, Delphi 2007 is already released with full Vista support
Delphi isn't dead, its running and living. A lot of programs are still coded with Delphi today.
I code my own programs using Delphi 2007 now, just great suite.
And to be a bit ontopic, I don't suggest reading books, by the time you bought them, they are already outdated. If you have zero experience do some tutorials on the web, if you have more experience just try to find a nice project you want to make, the Delphi helpfile is rather good, you can find a lot in it, not to forget how many forums there are if you run stuck on something.