With this new Nokia 6620, the move obvious question is what firmware to load:
* All About Symbian Forums - To all MP3 player inquirers: The 6600 is not an MP3 player!. Also describes how to load "symbian oggplay":http://symbianoggplay.sourceforge.net and also "dbpoweramp":http://www.dbpoweramp.com to convert MP3 or WMA to OGG
Its reportedly a good format down to 64Kpbs, although HE AAC is good down to 24-32Kpbs.