Update 3: ZodTTD, developer of several well-known emulators, recently met a similar fate as yongzh - both his Market account and his apps were removed. Today, he decided to clarify a few things in a blog post, noting that the removal of the apps was not due to an open source violation but rather came as a result of a trademark infringement letter from Sony to Google concerning PSX4Droid's icon. While yongzh did not publish any Sony emulators himself, it does seem that the big guys are taking an active interest in the emulator situation on the Market.
Update 2: Google has issued a generic response to our inquiry asking what led to the takedown:



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