I need the software that OSX has because there is no analogue in Linux.
This is one of my things also-my non-hobby PPC Macs have specific uses.
If I can't get software like Nikon Scan, Epson Scan, or Vuescan on there along with Photoshop it's of little use to me.
BTW, Nikon Scan is one of the reasons why I used a dual 2.7 for a long time even though I have a Quad on hand. The dual 2.7 is the fastest single core PPC Mac, and it makes a difference for a CPU-heavy single threaded program. My Coolscan 8000 is on lay-a-way, and if I hadn't completely switched over to the Mac Pro for these duties(which can blast through this stuff faster than I could have imagined even under Rosetta) it would have been a REALLY big deal. 4000dpi on a 1"x1.5" piece of film is a lot less processor intensive than on a 2 1/4x 2 1/4 or larger(realistically I think Hasselblads are 56mm x 56mm, and an RB67 is 57mmx70mm or so).
Of course, the Epson really grinds things to a halt when I do a 4x5 at 6200 dpi...and of course doing Digital ICE is adds a ton of processing time.
BTW, here's one piece of Linux software that I need some for offline data processing that-thank goodness-is now OS X native.
If you need to interface with hardware(and we're talking hardware that starts at ~$400K and goes up) you still should be running CentOS at a minimum and preferably RHEL.
http://openvnmrj.org/