I have used OSX for UNIX development and soon plan to use it as my 
primary development OS here at work. As far as the marketability of OSX 
programming skills, I cannot attest to that. I can tell you that Apple 
is still popular among researchers and that you will find the OSX/Linux 
combo to be prevelent in hot research areas like bioinformatics, 
proteomics, genomics (my trades).  I don't see OSX replacing LINUX on 
the server side of things for applications such as life science 
clusters, but there has been a lot of interest in the XServ on various 
life sciences mailing lists.

Joel Dudley
Faculty Research Associate
Arizona State University
Center for Evolutionary and Functional Genomics
http://lsweb.la.asu.edu/skumar/

Alan Gore wrote:

>Although I've been a Windows-with-a-little-Linux developer for years, I'm
>always exploring new areas in which I might train. Since the OSX operating
>systems seems to be winning a high degree of critical praise for Apple, has
>anyone here tried using  OSX Macs to do Unix development work? Do you see
>much of a market for this sort of thing?
>
>After all, the BSD core of OSX appears to be a full implementation of Unix,
>with a GUI that seems to work far better than any of the other Unix graphic
>shells on teh market today.
>
>Alan Gore
>
>
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