I have been a Treo owner for quite a while now, but I am just now starting to explore it's multimedia capabilities. I am trying to accomplish two things:

1) Listen to audio recordings stored on the memory card. I am going to be recording satellite radio shows, and can do so in a variety of formats. I usually choose .m4b because I can then bring it straight into iTunes and it is "bookmarkable". I assume I would have to use a different format in order to play it back on the Treo, but I am not sure which one. If anyone on the forum does this, can you point me to an instructional guide? How do you transfer the audio to the Treo?

2) Is there a way to get voice memos and voicemails stored on the Treo onto my Mac? How can I accomplish this?