Daily:
Apple iBook g4/1.2GHz(main) running OS X 10.4 Tiger
POMI tower from year 2000(secondary) currently running my own linux distro and ReactOS
POMI tower from year 1994(server) running tiny core linux, my own 16bit asm multitasking os and Apple Rhapsody dr2
Phone(I like to switch between these once in a month. This month I am using N-Gage):
-Nokia N-Gage QD running Symbian S60 v1
-Nokia 9300 running Symbian S80
-Nokia 9210 running Symbian S80
-Nokia 6110 running Nokia’s very simple own OS
-Nokia 7710 running Symbian S90
-Nokia 1610 running even simpler OS than 6110
-HTC Wildfire running Android 2.2.1

Playing aroud with:
3xCommodore 64 running KERNAL
2xAmiga 500 running Workbech 1.3 and MINIX(Actually used one daily for few weeks on 2009. Long story)
Mac Classic running System 6, System 7 and MacMINIX
Compaq preasario 9520 running FreeDOS/GEM
Nokia 770 running Maemo 1
Nokia n810 running Maemo 4

My work laptop, which is also used as a personal computer, is a MacBook Pro running Snow Leopard. For website development I run sites from a FreeBSD VM. Since I occasionally have to check sites in various versions of IE, I also have VMs for XP, Vista, and 7. My company does hosting on FreeBSD, which is why we also use it locally for development (that, and Apple keeps making changes that make development more difficult on the Mac for our particular CMS)

The devices i use are:

– iPhone 3GS – IOS 5
– Desktop PC – Fedora 15
– Work Laptop – Windows 7
– Lotsa servers at work – Sun (it hurts me to say Oracle) Solaris

Between all of them (except the servers) i switch almost seamlessly, almost same data present in all of them (bookmarks, accounts, etc)

I use Windows 7 Pro at both home and work, and have Android 2.3.7 on my phone.

As for my non-desk jobs, one uses Windows 2000 Pro still for the most part, while the other runs IBM 4690 v5 and XP SP2.

Windows XP at work.

Android phone
Ubuntu 11.03 laptop
Windows Vista desktop (which rarely even gets turned on, just to play some Pirates of the Burning Sea)

Windows 7 on my main gaming machine.
One Debian in a virtualbox on the win7 box.
Another Debian in my old computer that acts as home-server.
One Mac that runs on old PowerPC.
iPod is on iOs4, haven’t updated yet.
Then some random machines that are just lying around.

Windows on the work desktop.
Solaris in the datacenter.
Arch on my desktop.
Gentoo on my VPS.
My phone is an Android device.
I am between laptops… will probably be Arch if and when I get a new one.

1: Debian Squeeze XFCE
+ Windows 7 in other partition
2: Slackware 13 Fluxbox
3: XP
4: Android
5: does and iPod count?
No VMs because I don t like to run VMs (for no rational reason).
I ve been an OS nomad for some time, changing at least a couple of times a year. Lately I ve ALMOST settled with the OS, but have been changing desktop environment more often than is healthy

My current setups are –
Work:
XP machine
Win7 Machine
Win95 machine (I know, but it runs one of my CNCs)

Home:
Ubuntu with wmii, had to get rid of Unity
Xp Machine (used to be for games, now rarely gets booted)
NAS running some sort of linux
HP Proliant DL360 server running Ubuntu server (This is just a toy at the minute)
Ipad – iOS5
Android phone
IBM PS/1 – running dos for the good old days!

I also have virtual machines set up mainly XP, vista, win7 and some linux distros that I’ve sampled.

That’s about it. Sadly I don’t have a Mac… I want one, but can’t seem to make myself part with the money. Not sure what I’d do with one, and I’ve never really used OSX… maybe one day.

Phone: Android 2.3
Home:
Netbook: Debian (sid) [xfce]
Laptop: Debian (whizzy) [gnome]
Desktop1: Win7 64 / Debian (whizzy) [gnome]
Desktop2: Mint 9 LTS [lxde, gnome] / Debian (sid) [kde]
Server: Fedora 14 [headless]
Work:
Laptop: Win7 64 / Ubuntu current LTS
Desktop: Debian (whizzy) [gnome]
Server: RHEL 6

Several computers also run VMs with: WinXP, Solaris, BSD and probably others…