Just throwing out some of the themes I have running around back here behind the computer:
Planning your "Studio"
The Legal Side of The Photography Business
Different Photography Businesses
Choosing Products and Suppliers
The Computer for Editing
The Computer for Business
Software for Editing
Software for Business
Accounting and Bookkeeping
Websites and Blogs
Building Your Style, Portfolio and Brand
Those are a few off the top of my head... I am VERY open to suggestions here! What do I know that I can pass on or what don't I know that I can find out for you?