The guys at engadget.com compared the SonyEricsson Premini SO213 (which is the Premini II) against the SonyEricssom J300. That's like JAPAN vs. THE >REST OF THE WORLD. So who wins the battle? Of course the Premini, it's just more sophisticated, spec-wise and design-wise..

Here is another opic of the J300. Small, is it?!!

It’s a 128-512MB flash player with a
1.9-inch color screen, MP3, WMA, and OGG Vorbis support, photo viewer, FM tuner, voice and line-in recording,.
In additionit's got PIM features like addressbook and calendar.
The weak point of this device is the small memory.
Source: DAPreview.com

After the introduction of the W800 SonyEricsson today showed the newest product of this line. The W31S!

HA! You thought you'd be in heaverb! This phoneonly works on Japanese provider KDDI’s CDMA 1x WIN network. In addition to the music player and FM radio, you get a 2.01-megapixel camera and a 2.4-inch QVGA display.