Yep, multi-processor for multiple apps is really nice. Inter-thread communication is fast and inter-process communication (particularly when the processes are on different processors) is slow - but there isn't much cross-processor communication going on, so it doesn't matter.
There's some ugliness in the winnt cross-processor communication model in which, basically, all processors but one are stopped and their queues drained - enough overhead even without the stop/start that it made sense for msoft to produce uniprocessor and multiprocessor HALs, so single processor systems could avoid it.
Maybe they've improved things - or maybe it doesn't matter...
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