This morning I pulled up the Smashwords site, to see that the process for submission there is. Scanning it quickly, I can see that it is self explanatory, which is a relief. They begin by posting the caution that no one should update their work without first checking the Smashwords style guide (which they provide a link to). So far, so good. They also note that the publishing page is NOT where you submit an updated version of your work. Kudos Smashwords! I hope people read this stuff! The last thing they ask is that the person uploading the work is the original author or exclusive publisher. Another interesting note is that they do not publish public domain work, or Private Label Rights books.
Then comes the usual - book title, short description, long description, language, whether or not the book has adult content, pricing (you can give it out for free, charge a specific amount, give a certain percentage of the book to be read for free (sampling). Then comes the good stuff - which formats you want to publish in! Kindle, Nook and Palm for me. I may decide at a later date to add others. I will have to think about PDF format. adn am not sure where plain text would come in. Choose your cover image, the title of the book, sign their three item publishing agreement, and you are good to go!
Well, good to go except for the tiny fact that you have to promote your book! ;-) That is for another day!