I have:
Desktop I built - gaming hooked up to my 50" TV and surround sound in my basemant.
2 year old Lenovo Thinkpad laptop - web browsing/bill paying, occasional work from home, general use
ibook G4 from 2005 - was my college laptop, still works but the battery is shot so it needs to stay plugged in. Use it as a network location to stream music wirelessly to the above PCs.
the Old "Beast" - well taken care of Dell desktop my dad bought back in 2001 or so and just gave to me to use for [censored] and giggles. Fresh install of XP, not hooked up to the internet. Purely to play old games from when I was in middle school.