Smashwords is a distributor and retailer for ebooks. They have an entire section of their site devoted to publishing with Smashwords.
They provide tools for conversion from Microsoft Word.doc (NOT dock) files to various formats used.
They offer downloads from Apple's iBook Bookstores (31 countries), Barnes & Noble, Sony, Kobo, Baker & Taylor, Diesel, and others.
Smashwords Formatting Guides
The Smashwords Style Guide is free, and available in several formats and languages.
It's not only a good guide for Smashwords, it's a fair start to formatting an ebook in general, if you want to create your ebook by using software to convert from Microsoft Word.