If you notice, many of the images are .bmp's and so are the note templates, it treats those files all the same, creating copies (sigh!)... I just let them be, and when I connect to the PC (much faster file handling), I erase all the unwanted ones, but I wish it would only create a copy when you change the original, not every time.
I haven't navigated any card (yet), so I'm not sure how to get back to the file system from there, but you are right that it's not too easy or intuitive to do generally; that ladder button could be put to some use during document navigation, to function as a "close file and go back" button, eh? What I do really like is switching it on, hitting "books" once, then again, and having it open my last file at the last page I read, doesn't take long to be back where I was.
I've found just sticking the stylus back into its casing and then out again usually fixes it, without having to reboot, have you tried that?
Have fun and enjoy your reading!
