The T900 is still a fine camera, but has been replaced by the TX1 (you could also consider the TX7 a replacement). Here's what we had to say about the T900 when it was released in April 2009:
The Sony T900 is yet another stylish offering from one of the leading names in digital photography. A 4x optical zoom Carl Zeiss Vario-Tessar lens with Optical SteadyShot image stabilization and high quality 12.1-megapixel resolution ensures that you can get close to the action without sacrificing picture quality. Additionally, 720p high-definition movie capture mode allows you to capture those moments to important to keep on just one photo. Finally, Face Detection and Smile Shutter technology lets you get the perfect picture, every time. The T900 comes with 11 MB of built-in memory and utilizes Memory Stick Duo/PRO Duo Media for easy storage and sharing.