It is quite obviously that mp3, mp4 etc. is the new wave but there is a question. What will is the best way to have the same amount of condence music (100s) put on a pockect PC?

MP3 is not the best of them. I'd consider AAC, OGG or WMA. Even a 1GB card will do for plenty of songs.

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Can the WMP on the x50v play mp4 format? I've been using i-tunes to change everything to mp3 and then downloading to the Axim. Is this the best way to get music on the Axim? Problem with this is that then my files on my Mac are transformed into mp3 and I'd rather not have 2 sets of the same music on my Mac.

I'm open to suggestion.

Nope, WMP won't, but http://40th.com have software that will.

Always read stuff that will make you look good if you die in the middle of it.