One day after Nvidia released its certified Vista drivers, ATI releases a refresh of its display drivers for Windows Vista:
Catalyst® 7.2 Display Driver for Windows Vista (32 bit)
Catalyst® 7.2 Display Driver for Windows Vista (64 bit)
Be sure to read the Release Notes before installing these drivers.
[Update: Fixed release notes link.]
Ed Bott (@ wordpress.com) 
Release notes link doesn’t work – they have some sort of anti-leeching scheme on the server … grrrr!
Link is fixed now.
Argh, still no drivers enabling the TV tuner in the All-in-Wonder cards.
Thank you Ed!
These drivers solved my issue of jittery, jumpy graphics with my cheap Radeon X300 card and Vista. I’m not a gamer, and when I bought this Dimension 9100 a year ago Dell said it was a 128mb card…. Turns out it only has 32 mb on board and the rest is shared. Thank you Dell! Worked fine in XP but only gets a 2.0 rating in Vista.
Anyway, I will more than likely upgrade the card, but this will give me some time and I don’t have to look at a jumpy flashy screen in the meantime…. the new drivers resolved this issue.
Check this out — from one of the Yahoo Tech blogs: “…get your drivers ready before you install. Burn them all to a disc for future use. If searching the web manually or digging around in those awful vendor websites doesn’t really float your boat, check out RadarSync, which is offering a free, easy-to-browse clearinghouse for Vista drivers…..” The link for the page is http://www.radarsync.com/vista