Originally Posted by mowbray
Interested to know what aspects aren't 'fully' supported in case I ever decide to upgrade my '2'
The Kindle 2 now has the same native PDF support as the KDX, although it is less usable on the smaller screen.
Amazon licenced Adobe Digital Editions for the Kindle, but it did not implement most of the features of ADE and several open source PDF viewers are more capable than the Kindle's PDF viewer. The missing features are just about everything. No table of contents, no bookmarks, no annotations, no global indexing (for search). It is also missing page reflow. Like ADE, it does not support passworded PDFs.
To answer the original question, yes it is possible to port a full featured open source PDF viewer to an EInk device like the Kindle 2. The Hanlin's (for example) used XPDF before they switched to Adobe Digital Editions. The iLiad had very good PDF support because its open source PDF Reader was extensively hacked by its user community. There is now a version for the iLiad that does reflow (pPDF