I was going through the Holes extra's when I saw that they offer some sort of replacement guarantee if you register your DVD on-line. Now call me naive, but I haven't seen or heard of this before. (I don't seem to have much time to go through all the extras on the DVDs - yes, I'm so ashamed!) Does anyone know of any pros/cons for this offer? I don't rip or sell DVDs. (I'm assuming this offer is to help them combat piracy; plus give them a mailing list.) Occasionally I'll give them away when I double-dip. But all told I can't see a down side.