Besides the Sony Ericsson J100, Sony Ericsson also announces the K610 3G mobile phone at the 3GSM today.

The slim and lightweight Sony Ericsson K610 is only 17mm thick and weighs 92g. Features of the new Sony Ericsson 3G mobile phone include a 2MP digital camera, Sony Micro Stick M2 slot, 1.9 inch 262K color display, push e-mail support (P-IMAP), USB 2.0, Bluetooth, Infrared, Netfront HTML browser and mp3 player.
The Sony Ericsson K610 is a Dual Mode UMTS handset commercially available in Evening Red and Urban Silver colors and starts shipping during Q2 2006.
Sony Ericsson just recently released the business cool Sony Ericsson M600 3G phone.
More details about the Sony Ericsson K610 in this press-release.

Variants:
K610i - Dual mode UMTS (2100MHz) - GPRS 900/1800/1900 for Europe, Asia Pacific, Middle East, Africa
K610c - Dual mode UMTS (2100MHz) - GPRS 900/1800/1900 for Mainland China. (Launch for mainland China dependent on availability of 3G services.)