Another free jazz sampler from Amazon: Pi Records Amazon Sampler, by Various Artists.
57+ minutes long.

Reviews, track-samples and download-link here.

Track-list:  1. Levitation               Corey Wilkes, Abstraky Pulse 7:22 2. Waves                    Steve Lehman Octet           5:36 3. Headlong                 Fieldwork                    4:07 4. Khosh Reng (Maqam Awj)   Amir ElSaffar                7:49 5. Malachi                  Art Ensemble Of Chicago      9:01 6. English                  Rudresh Mahanthappa          4:53 7. Habeas Corpus            Vijay Iyer Quartet           5:58 8. Iraqi Businessman        Vijay Iyer, Mike Ladd        2:43 9. Todo el Mundo es Kitsch  Marc Ribot's Ceramic Dog     5:1210. Last One                 James "Blood" Ulmer          4:40