Gil the Arm would make such a great detective show. I hope Ringworld is successful so Amazon develops the rest of Larry Niven's known universe properties.
A lot of the 'Known Space' short stories could make fantastic episodes of an anthology. Imagine a really faithful retelling of 'The Ethics of Madness'!
The Mote in God's Eye could make an incredible movie.
I thought it would make a good mini-series. Needs like 3 or 4 hour long episodes.