My roommate and I have six in our dorm room, not counting crap like PDAs, cell phones, etc.
Hm. Let me think now.
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G4 533 w/ total 160 GB HD (two HDs), 1.12 GB RAM, OS X. My “primary” computer. Used for Photoshop, Dreamweaver, InDesign, Garageband, and much more.
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Athlon XP 1800 w/ total 60 GB HD, 1 GB RAM, XP Pro. My “primary” PC. It generally gets less use than my Mac but still is used regularly. In a purple case.
Both these computers share a monitor via KVM switch.
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Dell Pentium III 733 MHz, 256 MB RAM, total 16 GB HD (two HDs), XP Pro and Win 98, Dual Boot. Networked with Athlon. Still use this quite a bit, as it runs something that (for a complicated reason) the Athlon won’t.
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G4 400 w/ 60 GB HD, 512 MB RAM, OS X. Occasionally networked with the other G4. Used semi-regularly, mostly for music composition (Garageband).
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AMD K6 450 MHz w/ 128 MB RAM, total 14 GB HD (two HDs), Win 98 SE. (Not networked with anything.) Still used on occasion.
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Upgraded PowerPC 8600. Has G4 450 upgrade card, 40 GB HD, 768 MB RAM, OS 9. Has its limitations but is still used occasionally and is pretty fast with the G4 upgrade card.
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Crappy 486/66 w/ 16 MB RAM and pitifully small hard drive (something like 160 MBs total). Still works as far as I know, but is currently holding up some boxes and books.
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Old Powerbook laptop running OS 8.1. Still works as far as I know. Used for picking up email and light web surfing.
Hardware brag thread!! 
I only have 5, recently disposed of my old Windows 95er. I simply don’t have room for any more.
Only four. None faster than an 800MHZ with 512 Megs of RAM. None slower than a 400MHZ with 384 Megs of RAM. All manner of makes and models. Optical drives range from Creative to Ricoh to HP. Harddrives begin with an 8.4G and crawl on up to a 10.1G then to a 13.5G and scream right on up to a 30G drive.
I slowly upgrade the best of the systems as I acquire parts and or money.
I`m about to install a DVD burner on the 800.
I`m going to set up a network and get some practice with the stuff. Probably wireless.
At the moment I have two, a PIII 1.0 Gig laptop and a P4 1.8 desktop. I just gave my old rebuilt system to a friend so I could have room for my next computer which will be in the 3.0+ range somewhere.
Believe it or not, some people looked at me strangely when they found out I lived alone and had 3 computers.
{looks strangely at Who Me? }
At least I have one more family member than computers… 
You guys are making me feel bad that I only have two at home.
::: runs out to buy another :::
4 for 2 people - working to give 2 of them away, but probably will never happen.
Nine in all. They’re all on the LAN and all used regularly.
One with Windows 95
Two with Windows 98
One with Windows 2000 Server
One with Windows 2000 pro
One with Red Hat 9 Linux
Two with Windows XP
My kid’s mac in the basement. OS 10 I think.
Not to mention the X-Box and Playstation on the LAN also. Or the 386 I buried in the backyard for some poor sorry bastard to find with a metal detector in 30 years.
In our three person household:
3 desktops (1 with 18" LCD flat screen)
1 server running Linux
2 laptops
PDA
and a recently acquired blue tooth camera phone…does that count? 
Oh and roughly 10 PCs and laptops in various states of disrepair.
Hmmm…seems to be about average.
Two…maybe three.
This one and the other one. Oh, and my laptop makes three.
Ooooh, what kind of mainframe? I’ve never gotten to play with any mainframe’ish architecture.
In addition to several Intel machines capable of booting (between them all) Windows XP, Linux, and OpenBSD, I also have a VAXstation 3100/76 running VMS 5.5-2 and a Symbolics MacIvory II (a Lisp machine) running Genera 8.1 (the Symbolics system is a CPU card and two memory cards running on the bus of a Mac 2FX running some ancient version of MacOS).
I have far too many computers in my house. Outside of my collection of old critters (vic 20, tandy’s, etc) I have 3 in the office, one in the kids room and an extra for the wife. Of course, she doesn’t like that one so she’s always on mine. I also pack around a Sony Clie and my wife has an older Palm.
My collection of old crap is about 10 right now. I used to have about 40 but sold, gave away, or shot (with a shotgun) the other 30. I must say an old Mac Plus makes for a great target.
Currently 3.
Athlon 64 3400+, ATI 9800 Pro, 1G ram - shit hot gaming machine running XP. Scores orver 18,000 in 3dMark2001 and around 6500 in 3dMark2003. Over 950 fps in one of the Unreal Tournament 2003 flyby benhmarks.
Athlon 1.2, Nvidia 4800, 764M ram - recently demoted from gaming to messing about with various Linux distros, currently running SuSe 9 Professional
Toshiba Portege laptop from work.
All connected via wireless networking.
Twenty one PCs.
Four are networked and used daily.
Two DOS palmtops. Three laptops, two DOS.
One is a real IBM PC with the 4.77 MHz 8086 processor.
Lots of DOS PCs, some with data acquisition equipment.
Two. One for gaming and one for the internet.
Getting ready to buy a new one soon. It will make five:
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This computer: HP Pavilion 7865 w/1.2Ghz running WinMe
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HP Pavilion 3265 w/166Mhz Pentium 1 and Win95
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Custom built 386 running Windows 3.1 (built in 1992 and still running!)
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Laptop: Compaq Presario 1625 w/233Mhz Pentium 1 and Win98
We have 6: one for the missus, one for me, one each for the two little Igors, one for my radio (digital modes on amateur radio), and a file server. We have a router that serves as the internet gateway and feeds a 5-port hub. When missus Vlad brings her wireless-linked laptop home, that makes 7. Three pcs are built from scratch. This is her lab, as she teaches comp sci at a local business college.
Vlad/Igor
Some screamers there, for sure.
I will be starting a thread soon about networking some machines together.
You better be there pal!!