Why "distribute"?
It is considered polite to post any large document on a website and let people pick up the parts they want.
I would suggest posting a synopsis, an index, and several separate parts.
If you write the index in html or in a doc with html links then the parts can be accessed by clicking on the links.
I would recommend doc rather than pdf for ease of reading, copying extracts etc. Not docx, some folk still can't access that.
Nothing wrong with giving recipients the option by providing links to all possible file formats, let them choose.
It is possible to post on a separate site or within Yahoo!