First of all you can make any document into a PDF file fast and easy by just printing it from MS Word with a program like CutePDF which is free. Make sure you have some anchor text links in the PDF because the search engines do read the content. The other kind of link you want to add is any related affiliate links or links to your product sales pages.
If you do affiliate sales check to see if some of your favorite vendors have any re-brandable Ebooks ready to go right now. Some people upload these to Limewire and Bit-Torrent, though I have not tried that myself, some have reported good results.
These can be submitted to Ebook Directories and Document Directories
ChangeThis :: ChangeThis
Free-ebooks.net | Download free Fiction, Health, Romance and many more ebooks
Download Free Ebooks
eBook Directory – Search for eBooks, many free!
eLibrary – Open eBooks Directory
Free ebooks – Download 20,000 free ebooks at the eBook Directory.
Ebook and PDA Documents for your Handheld from Memoware – Free!
ebook educational site where you can read, submit and find free ebook.
SharewareeBooks.com – ebooks, ebook, shareware-ebooks
Ebookee.com: Free Download eBooks Search Engine!
Feedbooks | Food for the mind
How To | Read Free Online Books at HowTo.co.uk
E-Books Directory – Categorized Books, Short Reviews, Free Downloads
Google Books – Google Books
Idea Marketers – Book Bidding Process at IdeaMarketers
Document Sharing Sites:
Docstoc ? Documents, Templates, Forms, Ebooks, Papers & Presentations
Issuu – You Publish
Calaméo ? Publish and share documents
Publish Digital Magazines and More Online for Free | YUDU
Myebook – get it out there!
DocShare – A new way to share documents online
5GB of free space to upload and share your files, photos, videos and music – eSnips.com
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