I see it from my Archos. There really seems to be some type of either corruption or purposeful poisoining of Android Market at times. I have had this happen to me on other apps such as Zeam, Flash,... Each type I cleared the Cache and reset Market, more apps were visible from this "cleaning". I do know they tweak the settings in Market to make some apps not available for all devices. But, I think it does other things such as cache corruption as well.