Outside of desktop publishing, where is Apple gaining ground? Is anyone running thier corporate infrastructure on Apple? By the way, many businesses that were running their prod site on Linux servers are now pulling out and going back to Windows, myself included. It is just too much trouble trying to find qualified people to support that infrastructure that aren't total PITA's to work with.
I don't believe Apple is gaining any ground in desktop publishing, especially since the big Adobe products aren't intel-native for the new Macs.
Their general marketshare went up far more than any other PC manufacturer in the last year. OS X gave Apple a solid BSD server and all the server software that comes with it. Apple just made it brain-dead easy to set up and administer at a very low cost (check out OS X Server unlimited client price vs. Windows 2003 Server 25 client). As far as clients, using their relatively cheap server software to manage thousands of clients (including remote assistance, monitoring and updates) is also brain-dead easy.
Is anyone running thier corporate infrastructure on Apple?
Yes. We have a FReeper who supports business installs on Mac and Windows, and admittedly doesn't make as much money for Mac service calls. Aside from that, Apple's servers are popular in supercomputing clusters due to their hardware, UNIX base and the supercomputing tools that Apple ships, which make setting up a cluster, again, brain-dead.