I have Mac at home (and take it with me to work since there's wireless on the ferry). My work "productivity" machine is a lame hp toy laptop running WindBlows XPee - required primarily to use MS ButtLick for calendaring and email.
Actual software development (which I don't really do much anymore except in an explorational and testing capacity as I am now a dev manager) occurs on the ancient machina con sombrero rojo.
Hope this clears it all up.