Samsung's Ultra Edition II keeps on keepin' on with the U300, a 9.6-mm clamshell. It's got a 3-megapixel camera and 70MB of onboard space, although that isn't expandable via MicroSD for some reason. It packs a 2.2-inch LCD with 240x320 resolution and an external 96x16 OLED.
Like all the other Ultra Edition II's, it's hitting Europe next month with no concrete plans to bring it over here.
Press Release [Samsung]