The Sony Ericsson K810i is a good camera phone, but it lacks the wow factor of its predecessors -- if you don't already own a K800i then it's worth checking out.
Bluetooth, which is becoming common, is insecure. Attacks demonstrated at this year's Black Hat and Defcon conferences targeted mobile phones but also suggest that printers and other Bluetooth-enabled devices could be next.
Buying a mobile phone is more than a matter of picking the most feature-rich or slickest-looking device -- your usage and lifestyle are going to help you decide which is the the right plan and handset for you.