I have just bought an YP-P3 32 GB with a Firmware 1.28 EU (touch 6.C) whatever this means ...
anyway I love this player ... but I hate not having bookmarks to use for audio books (i.e. listen to an mp3, set a bookmark, listen to another mp3, some day after be able to listen to the bookmarked mp3 starting from the bookmarked position).
I hope they will add this feature in future. It would be really perfect to have this feature.
It would be even better to have a color "highlighting" feature for the file name when a bookmark has been set in it (I think of an audio book split in more mp3 files ... even if you have a bookmark in a file .. you still would have to remember which chapter/file you were listening to ....... i.e. in which file the bookmark is)