[kalleboo]

If I want to browse a site without it cluttering up my auto complete history.

Say you want to order an engagement ring for your girlfriend but don't want WEDDING RINGS R US showing up when you type "r" in the address bar

[agumonkey]

it could still be an issue if your disk get inspected (or worse replicated).

[tedunangst]

If your girlfriend is replicating your harddrive to determine what ring you're buying, maybe it's better if she finds out and you call off the wedding instead of going through with it.