I've got 3 computers though these months I only have my laptop:
Acer Aspire 1350
AMD MP 3000+
512MB RAM
40GB HDD
CD/DVD+/-RW (fuck if it works, I never managed to get a working DVD burned from it)
128MB Radeon Mobility (can't recall which card, 9700 I think)
15" screen (max 1024 * 768)
I have both Windows XP SP2 as Ubuntu 6 installed but I never use Ubuntu for various reasons. Its a piece of crap though, the cooling of the CPU has failed several times already, and now it failed again, its slow as hell (to prevent it from overheating I let it run at 800Mhz). Also, its very heave and just plain ugly.
I'd love to buy myself an nice 12" G4 (the fancy white ones, not the older models) those are just so damn sexy but meh, I don't have the money for it.
My main system when I'm home:
AMD XP 64 3000+
1GB (2x 512) RAM
280 GB HDD (120 + 160)
CD/DVD+/-RW
Radeon 9600 Pro 256MB Graphics card (if only I'd play more games then Solitaire).
Windows XP SP2 Pro
My server at home (personal + shell server)
Intel PII 350Mhz
384MB RAM
16MB Onboard video (Who needs graphics without a monitor;))
6GB HDD
Slow as fuck but it runs smooth with FreeBSD 6.0-STABLE, it had about 120 days of uptime before I moved out and shut it down

My current internet connection is crap though, the wireless I'm using woudn't reach speeds over 2kb/s (yes, I know, even 56k dial-up is faster) which makes it kind of anoying to browse the net (let alone ssh into a server and use irssi from there so no IRC for me till this connection gets a boost

)