This is a very informative and rather scary video.
I suggest all Information Security people watch it. Then show it to all their Internet users.
Home users should watch it too. They may learn something.
The good news is that drive-by downloads are almost impossible if you keep your machine fully patched which - for almost all Operating Systems - is free, so why not?
The official description is:
Network security analyst Corey Nachreiner, CISSP, shows what happens when you're browsing the Web and a "drive-by download" attack hits you. Produced by LiveSecurity for WatchGuard Technologies.
It is brilliant stuff and hopefully there will be more from these guys.