"At first glance, the new Mac Pro looks identical to its predecessors. The gleaming aluminium tower design is unchanged. Forget the diminutive Mac Mini and the slimline iMac - this is a full-scale tower chassis that would gladden the heart of any PC fanboy. It measures 500mm high, 200mm wide and 475mm back to front. Those handles moulded into the top panel are there for a reason: the unit weighs in at close to 20kg."

Dean goes on to describe features such as ports, the 8x DVD burner, inputs, outputs, video connectors, and the spare bay.  They also make the following mention:

"And, uniquely in the Mac range, the Mac Pro also has three PCI Express slots that can be used to upgrade the system - two PCIe x16 and one PCIe x4 - as well as three additional 3.5in drive bays for adding extra storage."

The review mentions key changes to the outside of the Mac Pro and the redesigned internals such as the Nehalem-class Xeon processors.

"The inside of the Mac Pro is immaculate - there's not a cable in sight, and the Ram and PCIe slots sit neatly in front of you waiting for upgrades to be installed. The sheer size of the heatsink on the Xeon chip is a bit alarming, but the heatsink never became too hot to touch while we were testing it, and the cooling fan in the base of the unit hums away quietly without making too much noise at all."

Dean's article provides images of Geekbench and Xbench Results that a Mac Pro 2 x 2.26GHZ against several Mac models including two iMac and Mac mini models.  Dean follows up these results with commentary and closes out the article with a verdict.  You can read his article here.

The Mac Pro is the flagship Mac desktop used by professionals in fields including video-editing and graphic design.