Mac, Windows, Or Linux?
catone: If anyone is interested, here are the stats for Rails Forum -- which is predictably pretty Mac heavy given how great Rails development is on a Mac.Windows: 47.84% /
Mac: 32.76% / 
Linux: 18.95% /
FreeBSD: 0.07%(iPhone is actually ahead of FreeBSD at 0.11% -- even though the site is not iPhone optimized at all)