I am really trying to make this TechNet Wiki article PKI Design Brief Overview a place from which we can answer the basic questions regarding PKI design and then point off to the more detailed information.

http://social.technet.microsoft.com/wiki/contents/articles/pki-design-brief-overview.aspx

Feel free to review this document. If you have pointers to great resources regarding PKI Design that are not there, please add them. If you have basic tips about PKI Design, please add those to the article as well.

Eventually, I want to pull all of this together in the TechNet Library, so we can have a good reference article there, with a link out to a "Community Version" on the TechNet Wiki PKI Design Brief Overview. This way people searching for this information can find it quickly.