I have purchased a MBA (love it!), and I am about to sell my Windows desktop. I will be duel-booting OS X and Win 7 on my MBA, and I might add a Mac mini or a self-built Windows box to my network down the road (mostly to serve video and other files). I am getting an Airport Extreme to add to my current wireless G router/DSL modem. The AE will serve as my wireless N access point (N for the MBA, G from the other wifi router for my iPhone), and I will use it to connect my printer and an external 1TB drive. I can't decide whether to built a cheap Windows box to be my file server (and to perform random tasks when the MBA is with me) or to buy some NAS system to serve my files. My other question is what format do I use for my external drive and a couple of pen drives I use as backup for my documents and pictures. They are currently formatted NTFS, and I realize I cannot modify them from OS X. But Mac formatting isn't visible in Windows without an added program, right? I often have files above the size limit for Fat32. So which format do I chose? One of the pen drives is used for school where I transfer Visual Studio programming files; another is a photo/document backup that I keep in a fireproof safe. Will I just need to keep one pen drive only for my programming classes formatted to NTFS? What do other people do?