[As described by Jeremiah Grossman, this is pretty nasty.][link] See the [proof-of-concept demo here][demo], and be creeped out. (via [Shawn Medero][shawn])
[link]: http://jeremiahgrossman.blogspot.com/2010/07/i-know-who-your-name-where-you-work-and.html “Jeremiah Grossman: I know who your name, where you work, and live (Safari v4 & v5)”
[demo]: http://ha.ckers.org/weird/safari_autofill.html “Safari Autofill Exploit”
[shawn]: http://shawn.medero.net “Shawn Medero”