Besides the one Amazon ships in the latest firmware versions ? ( <a href="http://www.amazon.com/gp/help/customer/display.html?nodeId=200324680" rel="nofollow">http://www.amazon.com/gp/help/customer/display.html?nodeId=2...</a> )<p>The manuals ( <a href="http://www.amazon.com/gp/help/customer/display.html?nodeId=200317150" rel="nofollow">http://www.amazon.com/gp/help/customer/display.html?nodeId=2...</a> ) seem to say you can bookmark PDF pages, but do not mention clippings or annotations, which are allowed for the mobi/azw default format.