Very good information. Thank you.

As a follow up question, I had read about setting up 301 redirects in my .htaccess file, which would as I read, would 1.) allow spiders to find my new pages / re-index them to the new locations, and 2.) not adversely affect my pagerank (in so much as it would not be seeing, what it thought were, "new" pages).

Does anyone have any thoughts about the potential downfalls of doing it this way? Thanks in advance.