About two years ago I switched to using Kubuntu most of the time. I still dual boot on both the desktop and notebook, but a majority of the time is spent on the Linux side.
I wouldn't have enough money to buy licenses for all the old boxes we have in the house, but with Linux they are all up and running, and each kid has their own Linux computer.
My hardware is too old to play the latest and greatest games, and with lack of free time, I like to fire up Civilization 4 for the occasional gaming bug. get Civ 4 to work under WINE, and I'd ditch Windows all together.
Libreoffice is good enough for me, and I like the feature that can print straight to pdf.
My Creative Zen is recognized under Kubuntu, and so is our ancient laser printer.
The kids computers run Linux (this month's flavor is Lubuntu) and they love it.