ExpanDrive
ExpanDrive acts just like a USB drive plugged into your Mac. Open, edit, and save files to remote computers from within your favorite programs—even when they are on a server half a world away. ExpanDrive enhances every single application on your computer by transparently connecting it to remote data.
Like JumpCut, ExpanDrive for the Mac is so good that I sometimes forget it’s not part of OS X. It really does make remote machines feel like mounted drives: put your machine to sleep, leave a server mounted for weeks on end, change networks, whatever—ExpanDrive doesn’t care, and makes sure your far-away files are ready to open in an instant.
I assume the original ExpanDrive for Windows is up to the same high standard—if not, let me know.