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Palm Digital Media

Franklin Electronic Publishers - (several formats) good site

Execubooks - book summaries (business books) ebook/audio formats

Mobipocket

FictionWise - several formats (mostly MSreader,Mobipocket,PalmReader) great site

Cyber Read - Mostly Mobipocket format ebooks

Audible.com - Books in mp3

ebookmall - several formats , mostly msreader format

PDA Bookstore - different ebooks starting at $4.00

Ebook Locator - find your ebook

Amazon - MS reader, Adobe ebook reader

Barnes&Noble - MS reader, adobe ebook reader

*rather than posting a new post, I will add to this post*

PerfectBound - various ebooks, good quality, at prices mostly with 20% discount on list prices (MS Reader, Adobe ebook reader, Palm Reader)

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SimonSays.com - high quality, 30%-40% discounts - MS Reader, Adobe, Palm Reader

ebookad.com - various ebooks at low prices - MS Reader, Palm Reader, Adobe