like i said, thats a lot of work, especially if u have a large collection of videos... don't get me wrong, i love the idea, and as long as the cover-flow gui is ADDED to wiimc instead of replacing the current list-style menu, then I think its a great idea.
but if cover-flow is the only view option, then it would suck to see a bunch of question marks covers everywhere... if u have your hard drive set up properly with covers, u can use the coverflow without any issues... but if u are just sticking a friends flash drive in the wii to watch a video, it will take forever to navigate to the right video if they all look the same... so for this reason, I think making this view an Option, and not the only option, is a great idea