Another free dance sampler from Amazon: Ultra All Stars, by The 2010 Sampler for Amazon: Various Artists.

Reviews, track-samples and download-link here.

Track-list:  1. I Am Not Drunk (Radio Edit)    Benny Benassi    3:06 2. Ten Seconds Before Sunrise    Tisto    7:31 3. 4:00 AM    Kaskade    4:18 4. Communication    Armin Van Buuren    4:16 5. The Bass    Sander Van Doorn    4:46 6. You Can Be The One    Late Night Alumni    3:13