Elvihtori sent me this Email today with a very usefull tip.
Hi there was a question about bookmarking audio files and the comment was about the future Podcasting application, which sounds cool.
Anyway I found that if you open an audio file from the Media gallery or the File Manager you can then switch to the music player and start playing a different song, then if you go back to the other song it will remember the track position.
So you can be listening to say a podcast or an audio book then pause and switch to the Music Player and listen for some other tracks then come back to the podcast and continue where you left.
Many Thanks Elvihtori, im sure this will be usefulll to many people.