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One computer- Mac- MBP. I use it for Email, Twitter, music (iTunes), family pics, Forums/Blogs/Message boards, FBook (not much anymore), School work, and just about everything.
 
iMac - Personal Use (e-mail, photography, cartooning, and some other fun stuff)

Dell Laptop - Work (GIS, docket writing, technical analysis using Excel, and some other slightly-boring stuff)
 
I have a Dell Precision M60 that is collecting dust, I doubt I will ever use it again. I also have my BlackBook, which has been my favorite computer for over a year now.
 
I have three:
15.4" UMBP 2.53 as my main computer
15.4" MBP Classic 2.23 for work
Dell 17" XPS 2 that I hardly use anymore

We also have three more computers in the house:
Wife: 20" iMac (Wants a Laptop)
12 year Old Son: 13" Black MacBook & 15.4" Dell Inspiron 6000 (both hooked up to one 25.5" HP monitor)
 
I own two computers and while necessary, feels a little extravagant.

A mac pro desktop for the heavy lifting and work when I'm at home.

A macbook pro laptop for field operations and working at the office, presentations etc. (I do not use it at starbucks)

I use dropbox to keep both in sync though wish there was an all in one easier solution.

I'm tempted to get a third laptop for field work in less savory places since i wouldn't want to get my MBP damaged but we'll see. At the moment, I think this will suffice.
 
I have 4 computers.

PowerMac G5 Quad
-I use this for video editing and other OSX - only applications that I love to use. That and I also love IBM (The driving force behind game-console processors). However, even though the processors run pretty cool for a G5, the noises it makes can be disconcerting at times.

RAID PC (hand-made)
-Not actually up and running yet. Being repurposed from the task of being a gaming computer; motherboard died, so I'm in the process of getting a new one. May also serve its original function as I can reinstall Windows and shove OpenSolaris on another partition. The RAID would be what I record to and work with while editing video (recording live HD). AMD Athlon x2 6400+ (aka 3.2 GHz dual). Also is getting some cheap Intel NICs for port teaming.

Dell Precision M4400
-School/Field computer. It games alright, but the main thing is just previewing video to make sure there are not any HDV artifacts. Of course, this is secondary - its primary purpose was just to be a school PC that could take some oomph. Uses an Intel T9800, and currently running Windows 7 Beta.

Retro Gaming PC (hand made)
-Like the title. Just for a run-down, 1 GHz AMD processor, 512 MB RAM, and 3DFX 5000 AGP graphics. It was awesome when it was made, and I got it when I was... 14? Runs classic games really well, although the power draw is.. significant. Half-Life and its derivatives, Civilizations 1,2, and 3 (!), Homeworld, and StarCraft are what this baby was made for!

The Power Mac is my favorite - OSX and FCS2. Would I like a MacPro? The 2.93 Octo? Yes please. However, it (and even the 2006 MP) were out of my price range...
 
1. 2.66 UMBP (main computer)

2. 2.00 mac mini (plex server)

The MBP is my favorite; it is a great machine !
 
1 macbook 2.4 ghz unibody. I use it for school. When not in class, I connect a monitor keyboard and mouse and use it in clamshell mode as a desktop
 
I have waaaay too many computers, can't use them all! ( Although I did recently sell two Black MacBooks for way more money than I thought I'd ever get for them.)
 
iMac 24" - primary machine.
Mac Mini G4 - TV/movie machine
iBook G4 12" - use while watching TV/Google random facts to settle discussions

I want an iPhone real bad.
 
In constant use:

PowerBook G4: Photoshop work, music production, the odd bit of World of Warcraft. web/email.

PowerMac G4: Mainly iTunes and web now

iBook G4: The wife uses for her uni work, web/email

Occasional use:

iMac 350: iTunes and web

In very occasional use:

PowerMac 7500: Old OS9 audio programs like BackToBasics

PowerBook 5300: using BackToBasics live.


I really do need some new machines :eek:
 
I have a 15' Alumni Body MBP from September which I use every day as my main computer and then a Dell XPS family computer that I might use once every two weeks or so.
 
3 currently, about to be 4.
Mac Pro - Heavy lifting
PowerBook - Lives in a box
MB Air - Couch surfing and travel buddy

Soon:
Mac Mini - Media center.

Favorite ... probably my Air believe it or not.
 
MacBook in Sig - Schoolwork, some photoshop work, some playing games, surfing the web and managing e-mail/eBay/Craigslist on the go (with tethering ;) )

Mac mini in Sig - Got it for my mom, traded my torn up AC30 for it after a tour- she was using an old Dell 1.0Ghz piece of crap laptop. hinges didn't work. keys stuck. needless to say. she is very happy

Dell Inspiron - Sitting around gather dust in the garage :)
 
MBP 17":
emails, 17" iPod, photoshop, work, mobile gaming, etc.

iMac white intel c2d, matt 20":
image editing.

PowerMac G4, headless:
server, online storage

Gaming PC, 24" LCD:
Games, wastes time to deal with stupid windows issues
 
I used to have a lot more, but I've been making an effort to simplify and conserve power. Currently, our household has four computers, I only work directly on two. That's down from 7 computers a few years ago.

1. 24" iMac 2.8GHz / 1.5TB / 4GB - my main workstation at home, I do personal design work and photography with this machine and its two 24" screens, and also my main iTunes library resides here.

2. 15.4" MacBook Pro 2.4GHz / 160GB / 4GB - my work laptop. Used for everything for my employer, also for home surfing and emailing while out on the couch. I hook it up to a 20" ACD while at work or a 20" Dell at home when doing actual work on it.

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3. Black MacBook 2.0 GHz / 100GB / 2 GB - my wife's one and only computer. She pretty much just does email, web surfing, the occasional word document, and a few personal photos.

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4. Mac Mini -- hooked up to the plasma TV and running Plex as a front end to my large video library which lives on a 1.5 TB D-Link NAS (which used to be a Linux server -- one of the computers I managed to eliminate).
 
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