If you start with PDF's you're fairly restricted in what you can do - apart from the reflowing (which is what's happening when you resize to M or L), you can switch to viewing in landscape (press & hold the resize button), or you can use some of the utils to reprocess the PDFs.
Just to be 100% sure, are you looking at the reader from a viewpoint of specifically reading existing PDF docs, or is it just that you've chosen PDF as an example format?
If the former, then if the reflow and/or landscape mode of the 505 aren't good enough, you'd be better off looking at the PRS-700, as that has a better PDF zoom. If it's just the format you've gone with, there are better alternatives! LRF, ePub or even PDF with a page size that matches the device, rather than A4/Letter.
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