At the moment:
--1 64-bit HP laptop, running 64-bit WindowsXP and also 64-bit Mandriva 2006 Linux.
--One desktop running WindowsXP
--One desktop running Fedora Core 4
--One handheld Sharp Zaurus SL5500 running Linux
--One Handheld Hewlett Packard Jornada 690, running Windows CE 2.11
--One handheld Nec MobilePro 790, running Windows CE 2.11
--One handheld Hewlett Packard Jornada 564, running PocketPC 2002
--One Psion 5MX handheld computer, running Epoc operating system
--One Apple Newton MessagePad 2000 handheld computer
Hmmmm
I think I have an adiction to very portable computing, with built-in keyboards!
Kevin A wrote: 
Let's go one step farther, what was/is your first computer and do you still own it?
Boy, now THAT brought back some memories! My first computer:
A Commodore Vic 20, with a whopping 4-Kilobyte (that is not a misprint!) memory, and with a cassette tape unit for storage. And it hooks up to the TV for a monitor! And yes, I still have it. I had some ham radio software for it.
Dr. Steve
Central old Mexico