[octopus]

Start a blog and write about your writing (seriously), put chapters from your books in a tutorial format and always link to the actual book.

A good book about blogging for technical people is ... "Technical blogging" by A. Cangiano.

It has a few chapters about promoting/marketing your blog and implicitly your product. For me this book was an eye opener for certain aspects of blogging.

[mapster]

yes. A friend started a blog, simply as compilation of technology of a specific type. A publisher contacted him and offered to publish if he wrote a book. Blogging is really priceless exposure.