if you look at oyur source code then you see INLINE - there is first the skyscrapper THEN the leaderboard hence HERE these minutes on a.m. URL only the skyscrapper full with ads - rest empty you have no niche on your site - you are OFF topic with the commerce world it seems that's why you have insufficient ads to fill more than the skyscrapper and only in certain geographical regions other NON-en ads may show up just change your site's topic to something of global and / or comercial value and interest and you have more adword participants to complete for ad space
Also they dont show up on smashmyipod.com/story.php?id=799 Some ads appear when you remove www. from the url, as well. I dont get what the hell is going on.
Sorry but this is wrong. if it cant find ads, it shows public service ads. Not to mention mp3 players are a real niche, with LOTS of interest.