In that vein... you still do have to buy a copy of Windows, but I've been running XP Home under Parallels on my Mac. It's fairly seamless and you don't have to re-boot into Windows as you do with Boot Camp. Supposedly VMWare Fusion is even nicer, but I've never tried it.

Besides the fitness software, there's no good mapping software for Mac. DeLorme StreetAtlas and Microsoft Streets & Trips ... unfortunately neither of them does everything, so you may need them both, but neither of them has a Mac version.

Garmin Training Center has a Mac version. It's not identical to the PC version, and actually I use them both. Both are free. SportTracks runs fine under Parallels. My Canon G9 came with a disc that has both Windows and Mac software. Printer drivers are free downloads. If you want to print wirelessly from Mac, you have to jerry-rig it with some printers, but the software is free and very stable.

DH is mostly a PC guy, but he's a semi-pro photographer, and bought a Mac last year just for his image processing. He says there's a significant advantage. He also just got a new laptop with Vista. With that one, he's having trouble printing wirelessly to his Epson printer, and Epson says it's not compatible with Vista, but other than that, no problems.