Nice that they first had Shazam and now Soundhound.
I think someone said it earlier, but I will give my point of view. The incentive that Amazon is giving devs by offering free items is that it will raise the D/L count for the app, and the apps are being reviewed favorably (because it seems that Amazon is offering quality apps for free); both of which leads to more D/L and more reviews! So it's kind of a brand awareness thing and it's very similar to those companies that give away free golf equipment so that the item is out there and people can give their input, so it becomes word-of-mouth advertising. I didn't know about Soundhound before today, and now that i have it I will probably recommend it to my friends and they may might even buy it; whereas if I didn't get a free copy, me nor my friends might ever know about it. Genius Amazon.