It is not up to Vista to make printers and such like compatible with it - that is down to the manufacturers of the printers, scanners, cameras, mp3s, mouse, keyboards...
As Vista has been out a few months many companies have made downloadable drivers available for their goods, so the teething problems that were present at the launch of Vista are now sorted.
As HP say that model will work with Vista, I would rely on that. If you do experience any difficulty, HP support is pretty good and will help you.