Hello Mr. Heller. I would recommend you to read the following post :http://arduino.cc/forum/index.php?PHPSESSID=c136000cc4ed2ecd8af74c1758907313&topic=139733.0
In this post it is mentioned that one issue has arise regarding integrity of the board. I commented there that some weeks ago I tried the Simple Audio Player
successfully using an Arduino SD card reader by Seeed Studio (SKU INT106D1P), but reading the post, I decided to wait for a correct tutotial
(noticed that Massimo Banzi commented that the current tutorial is wrong). regards!