Ebooks are all the rage, and if you have a book-length manuscript written, or even a long article, you can upload it and sell it on Amazon and Smashwords.  The question is: can you format it, and how tough is that?  The answers are, “Yes,” and “Kind of tough, but possible if you stick with it.”  By far the best place to start is uploading to Amazon, and the best place to learn how to do that is a blog called CJ’s Easy as Pie.  CJ, a very nice lady, takes you step by step through the process.  Also download the Smashwords formatting guide and read it carefully.  If you have a friend who knows a little HTML, all the better.  Give it a shot.  The feeling of control in being able to publish your own work is awesome!