This is one of the top of the line phones from the Nokia N series- the multimedia computers as they call them. This phone can do most of what one can want- 640x480 30fps video, 5 MP camera, 3D accelerometer (not known till about nov 2007).
This phone comes with a built in RFID Reader using the Near Field Communication Standard (NFC). This allows you to build applications that can interact with physical objects to buy things, receive information and more. Click here for an interesting project using RFID- albeit in a very simple fashion.
The Nokia N810 is an Internet appliance from Nokia, announced on October 17, 2007 at the Web 2.0 Summit in San Francisco. Despite Nokia's strong association with cellular products, the N810 is not a phone. It allows the user to browse the Internet and communicate using Wi-Fi networks or a cell phone via Bluetooth, and is small enough to fit in a pocket. (from Wikipeadia)