Homebuilt gaming rig, AMD 64 3800+ with 2GB Dual Channel RAM, 74GB 10KRPM WD Raptor and 160GB (Both SATA) ATI PCIx16 (forget the model) video card. Gaming rig uses XP SP3.
Dell GX-260 Optiplex Workstation with P4 3.06Ghz HT, 2GB PC3200 RAM. Use for some video encoding. XP SP3.
Compaq Presario 64-Bit Notebook with AMD 64 3200 Semperon, 160GB HDD and 2GB RAM with Vista SP1 that I take on network service calls.
Acer Aspire One Netbook with Windows 7 Beta till Windows 7 is released. (Really wanted the new Lenovo Ideapad Netbook but was given the Acer for free so had no choice).
OLD IBM ThinkPad 600x with XP Pro. Never lets me down. I can always count on it to work!
There are others but those are the main PC's that I use weekly.
Dysfunction, I love Thinkpads! I am jealous!
I consider a PC to be a Personal Computer and feel all personal computers are PC's.