I can't comment on Maya 8, but Photoshop CS seems to work perfectly on Windows Vista.Perhaps someone else will be able to confirm functionality of the other one.
I am about to get a highend computer and am trying to decide if I should have them install vista, or install XP and give me the vista disc.
My only concern is that Vista will give me problems with my art programs, like crashes in Maya 8 or Adobe CS programs. Does anyone know if there are any known issues with Vista and these programs? If I can run those smoothly I think I will go ahead and tell them to install Vista.