So I'm running lion and want to boot camp vista. Do i use my snow leopard install dvd to install the drivers or my computer's leopard that came with it or does lion have its own special thing?
I would take an educated guess that the older driver disk would work. Existing installs of XP or Vista continue to work with Lion. Only new installs, using Lion's drivers, would be restricted to Windows 7 (afaik).
There are a lot of combinations, involving particular Mac models and versions of OS-X. This KB article should have the exact answers you're looking for: http://support.apple.com/kb/HT1899