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MacPro Octo 2.8 (show pony workhorse)
MacMini 2009 2.0 (media center)
PowerBook 1.67ghz out of commission (works wonderfully but I have no need for it)

I use my MBAir most nights. My MP is on most of the day during the week while I work on my work-issued PC. The mini is on mostly on the weekends when I am less busy.
 
iMac 20" 2.4, main workhorse in the house. My Rev B MBA is my personal computer and I would say it's pretty evenly split workload wise. Love both machines. Bought my iMac in Dec of 2007 after many years of PC misery. My first computer 20+ years ago was an Apple and I am glad I returned to my roots.:D
 
also have 2.8ghz 24" iMac. technically also have a unibody 13" MB, but wife uses it most of the time. I don't think I could have my MBA be the only machine in the house.
 
Rev. A 1.8 80gb MBA for all of my day to day stuff... internet, office apps, data analysis.

custom PC for gaming, currently running vista ultimate

custom HTPC running windows 7 in the living room

I know, I'm one of those weird guys that has more than one OS working for him, but I much prefer my MBA and OSX for working on every day.
 
my Air is my primary computer. I also have two mini's (an older Power PC and a newer Intel) and a 12 Inch Powerbook G4. I typically control the other computers with the Air. The mini's have all the media on them, the Power PC acts as a print server and some other backgroud functions. The air is my baby.
 
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