High quality USB microphone that works on the iPhone 4 Can you recommend a high quality USB microphone that works on the iPhone 4? (Apparently there are issues with the iPhone 4 and USB microphones)
By "there are issues with the iPhone 4 and USB microphones," are you referring to the fact that no one has ever gotten them to work together?

The iPad, yes—but not the iPhone 4.

(Which, I think, answers the question about which mic I recommend…)