FM Radio for the N800
The Nokia N800, introduced in January 2007, was the first internet tablet from Nokia that featured a FM tuner chip (without RDS unfortunately).
And now the popular FM Radio application from the N900 is coming to the N800 real soon! I'm currently working on N800 support in the application so that both devices will be sharing a common code-base.
See FM Radio on the N800 in action: