Shared Memory

[John Wildberger]

I am in the market for a new computer and would like to sort out some of the 
advertising hype. 
What does "shared dual channel DDR2 SDRAM" imply?
-shared-: 
Is this a HW or SW feature? Does it share memory with a graphic card or does 
it share it between running processes?
-dual channel-:
Is this a feature of the memory or how the memory is used by the mobo to 
achieve an effective 800MB  data channel using a 400MB rated memory?
-DDR2-:
What is to be gained by using DDR2 versus DDR ?
I see more and more SATA drives being part of packaged computers. What are the 
pro's and con's for them? Are they more difficult to get installed with 
Linux?
John
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