Smartphones. I use my phones both as my phone and PIM and mp3 player (podcasts). I use btaudio to channel mp3 audio through a normal bluetooth earpiece; it's a Great Leap Forward to not get tangled in wires.
Unlocked T-Mobile SDA smartphone. My usual phone. Almost perfect, although the clik-stick pointer is annoying, and every once in a while I want a touch screen to make some action easier. Other than that, just brilliant.
Unlocked T-Mobile MDA PocketPC. I use this if I need email at a wifi hotspot, though I think the Eee will take its place for those duties.
Unlocked Palm 600. I prefer Palm, although they have been committing business suicide for the past several years. My perfect phone would be Microsoft hardware, Palm GUI on a linux OS. I hardly use this phone anymore because it has no bluetooth and no wifi.
Desktops
my workstation: debian linux, Gnome on a 1gHz Dell.
wife's workstation: debian linux, Gnome on a 1gHz Gateway.