OK ... first of all, I can't get enough of this site. NOW ... my issue. I downloaded doubletwist to the DX and to the MacBook. When I mounted the DX, I could see the SD card. When I created a playlist in doubletwist and sync'd some of the music made it to the DX. The MP3s made it over. The music in iTunes format, such as the songs I bought through the Apple store, did not make it over. I am sure there is a way to fix this, but I have now spent hours on this ... when I just want to listen to my music. The music that I actually BOUGHT! Grrrr ... You all rock .. thanks in advance.