Apple should include CrossFire and/or SLI support in Mac OS X in order to run at 5120x3200 resolution display...![]()
Note that most Mac Pro systems ship with adapters that can drive two 30" displays without issue for many uses (of course 3D gaming, etc. taxes this).
In the next couple of years we will have the GPU hardware to run something like a 30" cinema display at quadruple its current pixel count (2x resolution) at a reasonable price point. The main thing left missing is the connector technology (display port is bandwidth limited and UDI stalled) and robust OS / application support... and of course the displays.
2010 is looking reasonable IMHO