This is our home and home office server, set up in our hall closest. It's made up of Intel Mac MIni (Core Duo), stacked with two 500GB external drives (one Firewire, one USB 2) and a pair of 250GB FW drives on the left, setup as a mirrored RAID. The 250GB RAID handles all of my work-related files, while the 500GB FW is our iTunes/Apple TV media drive. The other 500GB (USB 2) is used for periodic backups of the media drive, which I run 2-3 times per week.
The stack on the far right is a Motorola Cable Modem, a D-Link Wireless G Gaming Router with Gigabit Ethernet, and the bottom is a D-Link Gigabit Switch.
This closest came with a home networking panel built in, with CAT-5 wiring running from the closest into each room of our condo (approx two jacks per room).