Take a look at Amazon Kindle publishing. Amazon are crying out for Kindle publishers and it seems there is a lot of money to be made.
I have been reading and clueing myself up just recently about Kindle publishing. The idea is to take the contents of some of my existing niche websites, rewriting and updating the content and converting them into ebook form for Kindle. If you already have one book written, might be worth publishing it in Kindle format and listing it in the Kindle store on Amazon. Nothing to lose but plenty to gain.