> I can't really see there's much demand for Java 1.3, or Dreamweaver 4.

Designate one bookshelf as your "memory shelf". Keep the books on the languages you learned the most from or that remind you of your best (or most horrible) projects, and place them on that shelf.

Display it prominently, and it will be become a conversation starter for every nerd that comes to your home. "OMG, I haven't thought about Dreamweaver in years!". You can then share war stories.

It will only get more fun as the years pass.