Sony Walkmans have used AAC by default, and they actually have the option of converting all MP3's to AAC's to improve storage space (mine roughly doubled the st

Sony Walkmans have used AAC by default, and they actually have the option of converting all MP3's to AAC's to improve storage space (mine roughly doubled the storage space using AAC's over MP3's for the same song). Creative Zen's also play AAC and sandisk's whatever, same with many Nokia Phones, even the DSi plays AAC's. Considering the considerable lack of choice when it comes to MP3 players, you're not exactly backed into the corner. You either have dirt cheap MP3 players that play solely MP3's or you buy an iPod/Walkman/Zune/Zen