The thing that interests me more about this phone is that apart from MP3 and AAC, it supports Sony's ATRAC3Plus format as well, which in my opinion, is perfect for hand held devices because it sounds better at lower bit rates, translating to lower file sizes, uses lower battery power to decode meaning your device gets more battery life. I can vouch for this as I've been using a Sony NW-HD1 for quite some time now. Sony created the ATRAC format, and they themselves aren't using it in their phones. Instead, they're just spray painting their existing phones and giving them different model numbers. Wouldn't it make sense to put ATRAC3Plus into Sony-Ericsson Walkman phones?
simply superb 
