Let's see -- here are the current computers that are active (defined as currently connected to the network):
1 server -- runs Win 2003 x64 as the base OS with PS3 Media Server running on the base OS as well. Also runs the free VMWare Server with VMs running a domain controller, web app server (Sharepoint dev environment and a Ventrilo server), a SQL 2008 Server (Sharepoint dev environment), and a Windows 7 media center that I just built and am in the process of configuring. Also contains copies of most of my DVDs for use with the media servers.
2 desktops -- main PC and my last generation main PC (Win 7 and XP)
1 HTPC -- currently powered off and will probably be discontinued, as with my media servers above and the fact we have DVRs, there isn't a lot of use for it (XP)
3 laptops (Win 7, Vista, XP)
ACTIVE: 7
Reserve computers -- work fine, but are not currently used and are stored:
3 desktops (2 XP, 1 Win 98) -- I will probably break these up and sell on eBay
1 laptop (1 Win 98)
RESERVE: 4
I have parts for at least one, if not two, more computers.
Computers which might work, but are currently stored in the garage (I am a sentimental fool and wanted to include these guys ):
1 Commodore 64
1 Vic 20
1 Commodore 128
1 Commodore Amiga 2000
UNCERTAIN: 4
Networked gaming consoles:
2 Xbox 360s
1 PS3
1 Wii
CONSOLES: 4
So in other words, way too many for a two person and one dog home. I just moved into this house late in 2008 and when I moved in, I got rid of at least 3 servers and enough computer components to build 3 to 4 more PCs. The wife wants me to get rid of anything computer-related in the garage.