I'm having the same issue, I think. I connect my new Kindle 2 to the computer, and I can see the Kindle device but when I click on it in Windows Explorer (I'm using XP), the device is blank. I know I have some books on it that I bought via Amazon - why doesn't anything show up?
And, I downloaded a .mobi book onto my PC from Open Library which is supposedly open source, and when I try to move it onto the Kindle by dragging/dropping I get an error "Cannot copy fairytalesofbrot00grim: Cannot find the specified file. Make sure you specify the correct path and file name." I am able to move the file around to other PC folders, just not onto the Kindle.
Help! What am I doing wrong?