Hi, I noticed your post on this. Do you think really the mac pro's days are really numbered as most on here are saying?
I suspect Apple will have a modular desktop computer, but the current Mac Pros tend to be pretty high-end machines. For example, the dual processor multiple-core machines with the latest Intel chips are a big part of that lineup, but there is actually very little software out there than can use that kind of power, and most of it tends to be professional-level and very expensive. Likewise, there are very few of us consumers than can use 4 drive bays, especially now that we can buy 2 TB drives. Very few of use need 8 terabytes to store our vacation pictures and a couple of DVDs. From the get-go the pro level is a pretty small part of the computer market, but it becomes VERY problematic for a company like Apple that makes its money off consumers rather than pros. And that problem is getting worse because that high-end Intel silicone is getting increasingly expensive. On their current path, Mac Pros are going to be non-sustainable because they're going to be getting increasingly expensive in the face of a very static or even decreasing professional market.
Illustrating the problem IMHO is Apple's flagship professional app Final Cut Studio. That program won't use multithreading and doesn't really benefit from running on an expensive machine with multiple processors, multiple cores, multiple threads. FCS will run just about as fast on an i7 iMac as it will on an 8-core Mac Pro.
Personally, I expect Apple will ultimately bring out a single-processor mid-tower with fewer drive bays, fewer PCIe slots and a cheaper CPU like the i7...IOW a modular tower version of the iMac. I see the big, server-class Mac Pros, if they survive at all, being relegated to custom builds for the professionals who need and can use the kind of power, size, and flexibility that they can have, and can more easily justify the expense because it's a business.