[iterati]

Originally Posted by rana

Any idea if PDF is the only format with this restriction ? Does the Mobipocket format display better on smaller screens ? Unfortunately my local library has many more PDF books than Mobi.

The issue with pdf is that is pre-structured in pages and it requires either that page to fit in the whole screen or zoom in/out. Think image. Another limitation is that you have to stick with the font that the pdf maker chose for you.
True/plain text is totally dynamic, think notepad, html, rtf. There is the option to change font size and family and therefore adjust the volume of the text that appears on the screen of the e-reader.
Mobipocker is mostly OK.