Another thing I like about the Mac setup is easy integration with the iPad, although I think you can do this too on a Windows machine.
I find useful an iPad app called Goodreader to manage and markup project pdf files, datasheets, annotated pcb screen shots and such. It's handy for carrying documentation to the bench.
Ipad also works as a third monitor for the Mac with an app called Air Display, for using on the bench, but it's not as handy as I thought it would be. Its main utility is portability for temporary visuals such as a section of a PCB layout. Most GUI elements are too small for easy use.
TI makes a nice iPad app for emulating its TI-nspire CX for iPad that I find useful for simple analysis.
I find an iPad app called SG Project Pro useful for simple project management.
Overall I find it very useful to have access to my project documents on a portable device. Working away from the office sometimes provides a nice change of scenery.
ChesterW