All the best hackers I know are gradually switching to Macs. My friend Robert said his whole research group at MIT recently bought themselves Powerbooks. These guys are not the graphic designers and grandmas who were buying Macs at Apple’s low point in the mid 1990s. They’re about as hardcore OS hackers as you can get.
The reason, of course, is OS X. Powerbooks are beautifully designed and run FreeBSD. What more do you need to know?