This is the X-Scream, a thrill ride on top of the Stratosphere. It is a teeter-totter that drops you off the side of the tower and lets you dangle nearly 900 feet over the Strip below. Just watching it made my knees weak. The Strip runs up the left side of photo with TI in the background. This was as far to my right as I could get so this was as much of the Strip as I could get in the shot.
I just "found" these photos again after forgetting about them for the last year after the trip. You might see a couple more in the next few days.
After Marchael's comment below I thought I would go back an add this shot to show you what happens when the ride gets out to the end of the beam. It stops there for a second and then drops about 12 feet or so before slidding back to the other end of the teeter-totter. Had the ride just slide out I might have done it but once I saw the plunge there was no way.