For various reasons, I have purchased a new Mac Mini to take the place of my older Cube, originally purchased in late 2000. (Loud scraping noises from the old hard drive were the last warning I needed -- second hard drive I've had to replace lately.)
It's wonderful. I swear to Jebus it's under two inches tall, and just wide enough to take a slot-loading CD/DVD. Built-in Airport and Bluetooth. Just finished putting my databases back in place from backup. Whisper-quiet. Didn't come with OS X 10.4 installed, but they gave me an upgrade DVD; no big deal on the installation, I usually wipe out any new machine anyway and reinstall from scratch.
The only downside was I had to buy a DVI-to-ADC converter to keep using the older Apple LCD Cinema Display.