11 that I actually sit in front of on a regular basis - mix of Pros, MBP's 17/15 and the Air + spare (which has been needed as soon as I picked it up)
3 x Pros @ home: General noodling. One Boot Camps Vista, but not all the time
4 x Pros @ work: Reviewing and modelling crunched data from the servers, related stuff
Air +spare @ everywhere: Mostly presentation - combined with notetaking, messageing and related stuff. Spare acquired recently, already in use while other one gets Applecared yet again 🙄
1 x 17" Macbook Pro @ home: More home noodling. The purchased spare is collecting dust so far, which has to be some kind of record
1 x 15" Macbook Pro @ work: Research collaboration, and also general office automation - everyone has one. We have plenty of spares to go around for the regular occasions when something goes wrong
Everything else is done under Windows.
Things have changed quite a way in the three months, during which the Vista-frontended / Linux backended replacement application suite to our OS X front/backended suite has reached the Vista frontend milestone.
And in terms of everything else remotely work-orientated we'd already switched back to Windows a while back, while for home / entertainment uses the only thing I genuinely need a Mac for is scriptable iTunes and EyeTV (for easy export of the TV to the Touch), as almost everything else I can get - musicmaking, media consumption, graphics, design, games, etc - is the same or superior under Windows.
Now:
One Pro @ home and the other two destined for disposal. Still same use but two have already been effectively replaced by Dell T7400's, and are consequently packed up awaiting sale. Right now, just haggling for best price from the brokers. and if I don't get it I'll put it up for private sale.
0 x Pros - yes, zero - at work. All brokered, and replaced by a mix of HP xw's and Dell Precisions which we already had kicking around.
0 x Airs - spare sold, remaining unit also packed up and up for sale.
0 x Macbook Pros - Gave 17" away to relative, and finally brokered all of our (in saleable condition) SR 15"s at work. The rest we sold back to staff, but the response was predictably lukewarm - with all of them apparently going to spouses, kids and suchlike.
I forgot to mention the iMac the last time. I now have a 20" iMac in the kitchen which nestles perfectly in it's nook, unlike the 24" before it.
The rest - a bunch of Sony's, HP's and Dells - are all (obviously) running Vista.
So this means I'm nearly free, and OS X is where it should be - doing completely unimportant stuff - at least on the desktop. The XServes are destined to be around for a while - but at least I don't have to sit in front of them.