Hi,
Your options for UNIX are mainly Linux or Mac OS X. It may be possible to use Linux for serious photo work, but I don't think it is really useful for professional work, partly because of weak support for color management.
That said, I was using Linux a long time and it has some advantages over Mac OS/X. I feel it handles memory better, for instance.
Regarding screens I think that they have matte screens again. Also, TN screens are pretty useless for editing weather matte or glossy. It is possible to run Windows on a Mac using "Boot camp" or VMWare or Parallells. You still need a Windows license to do that.
BTW, yes, I know about Open Solaris, AIX and Open BSD but I guess that Linux and Mac OS/X is where the action is.
Best regards
Erik
The thing that really drives me mad now with the laptop Mac is their glossy dictature.
Last time I went to the Macs stores here in Madrid, there was no other option than these bloody glossy screens.
I've been a Mac convinced for ages but now since the latest Mac politics and Windows 7, I'm running PCs. (yes I'm aware of the FW limitations).
Curiously, I don't notice that huge gap now between both platforms that I used to find a few years ago.
Cheers.
Edit: My dream, photo applications that would run under UNIX platform.