I don't actually know much of anything about how flash memory works. I just read the bit about data sticking around in the article, and assumed there would need to be some special action to make it actually delete stuff. However it works, it seems like this would be useful to know about your flash storage...since nobody documents the behavior of their flash drives, having one with your own (or Open Source) firmware would allow you to know what it does in a given circumstance, which is the only way to securely use any tech.