Note: these articles will form the core of a new ebook by this title. Disclaimer: I do not work for, represent, or am associated with anyone who works or represents the sites or products I've listed below. I'm not getting any fees for listing them here. Any company names, trademarks, etc, are the property of the respective company.
I didn't include the creation of the PDB ebook in the steps above for several reasons. One, because it isn't as widely used of a format. Two, because it isn't as easy to create as the others, requiring a little more file juggling and editing. Three, because it wasn't needed to upload any files to retailers. Four, because the Smashword conversion creates one that you can download if this format was needed.
That said, if you are going to sell ebooks on your own ebook store, or want a PDB file that will look more professional than the one Smashwords creates, then this can be a worthwhile file to create. Primarily because while not as widely used, the program to read the file can be installed on most smart phones and tablets. And personally, at least on my Windows machine, the computer version of the software is the best way to read an ebook on your computer. Unlike most every other ebook reader software you can download, it looks like a book, flips like a book, and is easy to read than the standard black on white. I like it better than reading a PDF on the computer. And like PDFs, the software to read them is free. So why leave a segment of the market that likes this format without access to your ebook?