EDIT: btw. what would happen if I'd visited asus.com, on XP, or without UAC enabled. Would this code have automatically run/installed? Or would it have been blocked anyway, and I'd have known nothing about it?
It would ask you if you wanted to install Adobe Flash Player Installer by Adobe Systems Incorporated and let you click a link that says "This digital signature is OK" and shows you the timestamp from VeriSign etc etc.
instead of just saying "Something's happening - you're going to have to click "let it happen" to find out what though".
Seriously, that's retarded.
P.S. it just worked in Firefox.