After upgrading to an iPhone4, I've taken the opportunity to do a thorough cleaning of my iTunes library. I'm meticulously fixing the info and art for every track, and every album. Since I plan on hopping into an iPad sometime in the next 6 months or so, I might as well make sure my library is ready to migrate over to my iPad. So, what would you say is the ideal resolution for cover art when viewing coverflow on an iPad? I've been trying to stay as high as possible, but am averaging around 500x500.