Hotel Joule, Dallas: Part of the pool juts out from the building with only a thick pane of glass between swimmers and the city ten floors below. (From 21 of the world’s sexiest rooftop pools on Matador Network)
This is also a great idea for an indoor pool. Although the homes isn't totally my taste. But I like the idea of a fireplace, chandeliers & the swimming pool being a strip down the center, with a two story building.
I saw this in Charlotte Homearama. It was a nice water feature while you were sitting on the patio and it looked easy to make if you can drill a million tiny holes in a piece of copper tubing and connect it to a recirculating water pump.