There was also the short lived Gigabit Ethernet (one of which was the first Mac that I owned). I remember rocking along with the blazing 400 Mhz G4 and 512MB of RAM.
I later upgraded it to a 1Ghz CPU, 1GB of RAM, and loaded 10.4. I loved that tower, and the design is great. Sadly the power supply went on it in 2007, so I bought a another used tower for $20 on eBay. Gave it to my Dad, who still uses the thing for email and the like.