Grumpy Old Bookman, who knows a thing or two about it, discusses 'Practical Books for Writers' in the most recent entry on his blog. The first looks like a common-or-garden how-to-write book and is perhaps less interesting. But the other two - about book design for self-publishers using Word, and using the Internet for publicity and marketing - look pretty good.
http://grumpyoldbookman.blogspot.com/
Emma