Robin Good's insight:
Resurrect Pages is a free Firefox Add-on that allows you to instantly find archived and cached copies for any dead page or broken URL.
Specifically, Resurrect searches through these cache/mirrors:
- Google Cache
- Yahoo! Cache
- The Internet Archive
- MSN Cache
Free to use.
Try it out now: https://addons.mozilla.org/en-US/firefox/addon/resurrect-pages/