Great question, and thanks for asking it. I look forward to the discussion.
My reason for two identities was this; Knappster is a regular owner of an XK who started a forum and wants to be just one of the guys. Steel Armadillo is a business and as such has it's own identity. It would be much easier for me to always log in as one ID and I am all for it unless there is a swing that suggests two identities makes more sense.