Quite often, tech junkies, like myself, have 2, 3, 4+ PCs of their own. How many do you currently have?
 
I currently have 5 working PC's (and they are all being used):
 
- the P4 rig in the sig
- P3 800EB, 512 Mb RAM
- P2 450, 384 Mb RAM (firewall)
- K6/2 300 @ 366MHz, 256 Mb RAM (fax, printer, file sharing)
- K6/2 300 @ 366MHz, 256 Mb RAM (used for browsing)

I have one notebook only.
But my family have totally 4 computers:
- 1 notebook (P-M 1.73GHz)
- 3 desktop
  ~ AMD Sempron 3000+ (Socket AM2)
  ~ AMD Sempron 2500+ (Socket 754)
  ~ AMD Sempron 2200+ (Socket A) - server

HP dv5000t (Core Duo) notebook (primary machine)
P4 Northwood 3.06 (OCed and undervolted, folding / media server machine)
Athlon64 3500+ Venice rig my sister uses at home (it's mine)
1.4Ghz Tualatin Celeron my parents use at home

I have the pc in my sig, a macbook, an emac, a G3 powerbook, and a sawtooth G4. The G4 doesnt have a processor or hdd ATM, but will in a month or two, then it will be a fully funtioning, integral part of my computer collection.

Two.
 
1. Primary Rig
 
2. HTPC

1.  My rig, custom built gaming machines (see sig)
2.  My wife's office - Dell Dimension, 768 mb RAM, IGP
3.  Wife's laptop (owned by her work), dell latitude, really nice machine

- Current rig (e6600, 8800gtx etc)
- An IBM e-series Server (p4 1.8, 1gig ram..)
 
- Old rig is on family house (barton 2500->3200, 1gig...)
- and ex-wife took my p4 2.66 PC
 

3 Servers
4 Workstations

I have three right now. It was 4 but I gave an old P3 away. I actually have no more Intel as my Intel laptop died.

Actually, I came to the conclusion that having that many PC's is actually my fault.
 
I simply cannot sell my old hardware. There have been very few times in my life I disposed of old hardware.  
 
The 5 listed are working, but I still have a plethora of components that could be built into fully working machines (mobo, CPU, ram, HD, case, psu, etc, etc, etc). Most of them are P2, K6-2 and previous generations.

i have three although i only use the one in my sig.  my oldest one a xp1800, 1 gig ram and a 9700pro is now my parents,  i also have a laptop, p43.2ghz, 2 gigs ram and a mobility 9800 pro which again is with  my parents.  i found i didn't use the laptop that much once i got this machine so they now have the laptop downstairs and the older one upstairs.
 
  so technically, i only have one.

Working PCs:
 
Main computer
  - MacBook Pro
Second laptop for use as a video source when VJing
  - G3 iBook
SFF PC for use as VJing video source (DOS or Linux progs)
  -  Compaq EN SFF PII350
File server
  - G4 Powermac with a Highpoint 2220, 8x320GB, 2x300GB and 2x120GB drives.
Main Windows/Gaming PC
  - Barton XP3200+ and a Radeon 9700pro
Web server
  - Sempron 2400 in a shuttle SN45G
Firewall
  - P120 at 90 with 3 NICs
2x HTPCs
  - chipped XBOXs with XBMC
Family's computer
  - G4 Powermac
 
 
Stuff I'm working on:
 
Netboot/Web server/firewall/gateway for internet cafe
  - dual PIII 1Ghz with 6x 9GB U160 SCSI drives.
9 Diskless terminals
  - Compaq Deskpro EP/EN PII300 - PIII450.
Netboot POVRAY rendering server for a beowulf type cluster
  - Sun Enterprise 450, dual SparcII 300s and 10x9GB + 2X18GB drives.
Time lapse photography/motion triggered video recording system
  - VIA Epia ME6000.
Wardriving/walking system
  - HP Jornada 720 running NetBSD, with a Lucent card and GPS.

I can't get rid of hardware either.  My lowest specced was a 486SX25, until I used its case as a mounting/weather shield for my projector.
 
Now the lowest is a 486SX33

Whenever I get a new computer my sister or parents get an upgrade(my old computer).  So I always have one computer... well for a few weeks I had 2, but then gave my old one to my sis...

4 pc's in total & 2 laptops
mine (the one in my sig)
an Athlon XP 2800+
an Athlon XP 2600+
an Athlon 64 something or other (dad's & dont remember what it is)
 
A Sony Viao notebook & an old as heck IBM Thinkpad

3
 
New rig
Old rig
Laptop

5
 
P4, P3, P2 + 2 laptops
 
only the first two are being used
 
it's hard to get rid of the old ones - nobody wants them, I can't give them away

Main Machine P4 775 650 SLI 7800GT
Game Machine C2D 6600 SLI 8800GTX
Game Sever P4 775 640 6600GT
Blue Room P4 775 640 6800GS
Green Room P4 775 511 ATI 9800 PRO

5 machines.
 
2 hand built machines (my favorites)
P4 northwood @ 3.2Ghz and a PD 805 @ just shy of 4Ghz.
 
2 Compaq Athlon 64's 3500+'s  
 
1 Gateway note book.  (good deal for 400$)  
 
I probably have enough junk hardware hidden away to build another 2 or 3 working machines.

I have 11, all built out by me:
 
1 - Domain Controller, Celeron 1Ghz, 512MB Ram
1 - Exchange Server, Dual PIII 700, 2GB RAM
2 - Web Servers, A64 3000+ 1GB (also runs SQL), Athlon XP 1700+ 512MB
1 - Media Server - Athlon XP 1700+, 1GB
 
1 - Desktop (shared by kids)  A64 3700+, 1GB
1 - Desktop (wifes) P4 2.4Ghz (Northwood), 1GB
1 - Desktop (my main rig) C2D E6600, 2GB
1 - Desktop (linux desktop) C2D E6400, 1GB
 
1 - Media center PC A64 3000+, 1GB
 
1 - DOS P133, 64MB (Used for playing old school games like Ultima 1-VII, Dark Forces, etc.  My kids love these old games for some reason)

Good question.
As far as PCs - 3
1 PDA
1 smart mobile
tend to connect them by wire as much as possible
BTooth goes haywire in my house
Too much noise I guess