That's the primary reason we want members to attach things to posts!
I've seen many things disappear over the years. We've done our best at this site to archive information, scripts, files, etc. Because what almost always happens is the person loses interest within 5 years, and their project/info/docs/whatever can quickly disappear (expiring domains, etc). Or they rely on some "free" location that disappears (Geocities, Xoom, Networ54, etc). And not just sites, but sometimes entire forums, countless discussions ... poof, gone. Sometimes the Wayback helps, sometimes not.