This brings up a cool Mozilla trick that probably works in Internet Explorer: When you know a page that you read recently has been deleted or altered, you can bring up the last version you saw by doing this before visiting the site again: Go offline by choosing, then click the link. You'll see the cached copy of the page.
A useful trick, but what you really want is to be able to get a 404 from a page and then have Mozilla dredge the cache.
I should mention that to them. Yep, I should do that...
Thanks, Roger! This page had been deleted by the time I saw it mentioned online, and I'm glad somebody saved their cached copy.