See this thread, lots of good info:
https://www.mobileread.com/forums/showthread.php?t=11820
In regards to another ebook/file uploader for the Sony Reader on OS X besides the very promising (but still in development) LIBPRS500 package, try this web site:
http://labs.docudesk.com/
They offer a free Sony Reader eBook uploader that is working well for me. It's very basic (doesn't support collections) but will upload eBooks (lrf, txt, rtf, pdf) as well as pictures and music (mp3, aac) files.
I believe they use the MacFUSE system extensions (
http://code.google.com/p/macfuse/) to define a virtual file system that OS X understands when the Reader is hooked up to the USB port. If you're handy with the Unix command line (Terminal) then you can actually browse all the files on your Reader (books, pictures, music) it's internal database that tracks loaded books and collections (.xml format) and it's SD Card/Memory stick's contents by going to the /Volumes folder and looking for the Sony Reader's filesystem mounted there.
http://labs.docudesk.com/latest-tech...-for-os-x.html
I also use their DeskUNPDF application to convert PDF's to LRF and it seems to work well for most PDF's (not all PDF's will reflow properly for viewing on the Sony Reader though you'll have to play with the various settings to get some PDF's to convert well). It too is free (trial period for conversion to .doc, .txt and other editable formats expires as of 6/15 unless you purchase, but they've generously kept the .lrf conversion capabilities free).
http://labs.docudesk.com/latest-tech...-previews.html
Dave