I believe you can zoom in on image based PDF files, using the slider bar on the upper left corner. Navigation is by arrow keys located at the edge of each side of the screen. You can also drag your finger or stylus around to navigate within the image, it's a bit crude but sounds like what you're looking for.
I checked this out on a PDF book with graphics on cover page. Works great.
Last edited by Wetdogeared; 11-21-2008 at 01:35 PM.
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