[j88439h84]

Have you considered linking to a Wayback Machine archive page instead?

[waferbaby]

It's funny, I was seriously considering doing just that a day or so ago. I think I might.

[all2]

You could have a service that runs in the background (say once a week) on all outbound links that checks for 404s and then automatically updates the outbound link to the archive.org link. That or have both links.