I don't have any current links, but I did find a company that makes this set-up when I was researching prior to having the pool built. It was expensive, but dramatically incresed the efficency of both tasks. Here in AZ, it would only work for a month or so in the spring and fall. Then the pool water would get too hot.

Along similar lines, I had a discussion with a factory rep about installing a heat pump, and he said you CAN get measurable efficiency gains by placing the pool heat pump right next to the A/C unit. If you wanted to get tricky, you could construct some panels to either encourage or discourage the mixing of the air streams depending on the season.