More obvious user script alterations?

Rael made a pretty high-profile mistake in posting that Google had added delicious tags to its results page. It turns out that these tags were supplied by the Annotate Google user script, which he'd installed and forgotten.

He raises the point that the user-writable web is likely to raise more such issues:

While I'm as much a fan of the writeable and rewriteable Web as anyone..., is
that cute little Greasemonkey in the bottom-right corner of my browser
notification enough? (Apparently not.)

Point taken. But is this something that should be solved by more obvious changes, or by more awareness of the augmented web? I don't expect my email client to show the same contacts as Rael's. Why should I expect my search results to be the same as Rael's?

OK, it's a stretch, but maybe we can agree that if the augmented web continues to become more popular, this becomes a non-issue.

If we can't agree on that, how could the augmentations be made more obvious? Mouseover'd aura element borders? A monkey icon that smiles more largely when scripts have been injected? A siren that sounds when you've forgotten, again, that this page is augmented?

That last one may be a bit annoying.

Suggestions? Comments welcome, or send 'em to the list.