I have a Macbook that runs Leopard and my desktop runs WinXP Pro. I prefer the Mac OS to Windows, but the Windows PC has more powerful hardware for running the graphics apps and my little white Macbook just can't keep up.It also has a 24in display and a full-size keyboard, which makes it a little more practicle to use for long periods of time. Some day, when I can justify the expense of a 24in iMac, I'll switch entirely to Mac. In the mean time, I use them both about equally. The Mac is far superior as a dev environment.