This is the print version of http://www.quackit.com/web_design/Index.cfm
OK, OK, so some of the stuff here might not be web "design" as such, but the average web designer should really know about them...
Web Design Glossary
Glossary of commonly used terms related to web design.
Rollover images
Mr & Mrs It have had quadruplets and need your help! Confused? Nothing
to do with rollover images? Go ahead and take a look then!
GIF vs JPEG
Learn about the differences between GIF and JPEG, and when you should use each one.
Add ActiveX controls to your site
You don't need to be a programmer to add heaps of functionality to your
site.
Convincing animated gifs
Want to create 'cartoon style' animated gifs? Here's a handy tip to remember...
Add audio to your web pages
Give your users some entertainment. They can even take over the sound
controls!
QuickTime
Add a quicktime movie or even Cubi VR (360° Navigation)