I would suggest you get yourself a copy of the IAEI 2008 Analysis of Changes book. This way you can get a good overview of the significant changes that have occured between the 2005 and 2008 editions.
I started a cross-referecne checklist sometime back to give to contractors when I thought the code was going to be changed this year. I put that project on hold now that it looks like the 2008 NEC will not be adopted.
I will send you what I have anyway...
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Bryan P. Holland, MCP