I took a glider ride at Moriarty, NM on Sunday. It was pretty incredible. Also, I suck as a pilot so much, it's incredible too. I don't think I had the string centered for more than 3 seconds at a time, if at all.
We took a tow to about 1800 AGL or 8k and from there climbed above 15k, where we caught the mountain wave. My pilot, Dave, said that on a good day people fly from Moriarty to Colorado and back, by hopping from a cloud to cloud.
One unexpected thing is just how loud the wind noise is. Even when doing 40 knots I have to raise my voice above it to be heard.
UPDATE: A Google search unearths an interview with my pilot, Mr. David Sharp.