It's been really cool seeing everyone's setup :yes:
My main computer for the last 7 or so years has been an MBP. I just upgraded a week ago to this Mid 2012 Retina 15" MBP and I'm loving it.
Core i7, 16GB RAM running Mavericks
The company I work for is 95% Windows so my work computer is a Dell Optiplex 740
Windows 8.1
At home we have an old 2006 iMac since my wife and I both have laptops. It's running Lion I believe and we use it for general stuff when we don't want to use our laptops and for printing/scanning.
My wife has a Dell Lattitude laptop running Windows 7. It's got a 128GB SSD and 8GB of RAM, gonna be upgrading it to Win 8 in a week or two.
I have two older laptops and a desktop in my basement running Windows 98, XP and Vista. I use the Windows 98 laptop with an attachment to plug into my VW harness to diagnose trouble codes and change settings. The desktop I was supposed to reload and clean up to give to a friend but it's been a year and now I don't know if they will even want it anymore. The other laptop was an older laptop that I got from work I may reload it and just use it as some kind of server.