Need some seo advice on site question

I have several different domains selling reports (ebooks) that I have written, or bought the resale rights to. I do ok, but promoting many different sites, with article submissions, backlinks, posting to blogs, and site maintenance has become a pain. I'm not an outsource type of guy.

Here's my question. These books are on totally different subjects like saving money, recipes, relationships, depression ect. I am thinking of putting them all on one domain, with a blog, on the same domain. mydomain.com and mydomain.com/blog

This way I can put all my efforts into one domain and the sub pages for the individual books, and post to one blog. Also all my promoting like article submissions and such can all be directed at one domain.

Will this work for the search engines. My concern is that I have books on many different topics. I would be posting to free blogs, and my blog with posts on completely different subjects, and submitting articles to the directories in the same way.

Will the search engines accept this as good content, or punish me. I write all my content that I post on the sites, and in the blogs, so it is not duplicate.

I need to know from some warriors out there, that know more about this than me.

Thanks Glenn