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I don't have one yet, but I'll be running Logic Pro, Ableton Live and other music making programs on it, that require a lot of power and memory. I'm also a hobby photographer and would be using Lightroom 3 and Photoshop 5.

So I (not so patiently) wait for the new mac

(so that the older once may drop in price a little enough for me to get one)
:D
 
Photoshop, Illustrator, After Effects, Dreamweaver, Flash, Cinema 4D,
Realflow, Photography..

Freelancer.
 
professional audio work. I do not have one at home but we have about 5 at the studio. usually using the mps as the host and have multiple pcs hooked up as slaves.
 
I'm a composer in the classical tradition. I bought my Mac Pro to serve as a host for the Vienna Symphonic Library, a massive sample set used to replicate the performance of an orchestra. There isn't a great deal of audience support for new classical music, so I actually chose to get a Mac Pro for budgetary reasons, as hiring an orchestra or large ensemble for recording sessions is agonizingly expensive. I use the sample set to generate the large instrumental groups, record the solo and vocal performances, and meld and balance them together in Logic.
 
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