To your question,
The Brewer's Association Guide to Starting Your Own Brewery
By Dick Cantwell
A great, thorough, very well written overview introduction to those seriously considering opening a brewery.
Brewery Operation Manual
By Tom Hennessy
While I haven't finished, its a good overview. Not as well written as the BA book and seems to take more of a "cheap and easy" approach to going pro, which may be perfect for some.