Apple has updated its vintage and obsolete products list to include many classic Mac products. The list of recently added hardware, as covered by TUAW, includes some of the staples of my early exposure to the "modern" mac.
The complete vintage and obsolete products list can be found here, while newer additions include:
Apple Cinema and Studio Displays with ADC (and the 17" LCD)
A selection of early 2004 iBook G4 models
eMac (USB 2.0)
PowerBook G4 (DVI)
AirPort Base Station (Dual Ethernet)
I fondly recall working on the ADC Cinema Displays in our college Mac Lab, admiring my roommate's brand new, state-of-the-art PowerBook G4 notebook, and trying to figure out how to scrape together enough cash to finally buy a Mac. These were the products that helped launch Apple Retail into critical acclaim and solidify Apple's ability to continue to innovate and create amazing machines. To all the recently listed, you will be missed.
Vintage products are those that were discontinued more than five and less than seven years ago.
Obsolete products are those that were discontinued more than seven years ago. Apple has discontinued all hardware service for obsolete products with no exceptions. Service providers cannot order parts for obsolete products.