While the iPhone is not designed as a document reader, you can read PDFs, HTML, Word and Excel attachments in email. However PDFs have pages so small they're worthless. Word docs have text so small they're useless and Excel files, well they're Excel files and only useful when viewed on a wide-screen TV. Fortunately in TextEdit you can save files as HTML. With 16 or 18 pt type for body text, these read well as email attachments. You can't add images but if you use proper syntax in proper links created from Format/Text/Links, they work fine. URLs are standard. Email links are mailto:name@domain and telphone links are tel:0000000000. You'll want to check this if you plan on using TextEdit to create Web pages to be viewed in iPhone's Safari.
