MTV has had tons of lip synched performances. Nsync and Britney Spears do it a lot, mostly just to their choruses, but they still pretend they're singing them. Stupid. Kelly was lip syncing, it was obvious. I wouldn't expect her to do that either, but whatever, it's not like I really care. I think Eminem was singing over his real song too, he was definitely singing, but I kinda thought he had the full version going on in the background. I wish the White Stripes had done something with legos for their performance.
If I were an awards show producer I wouldn't let anyone on who was gonna lip sync. That is just dumb. I wouldn't even let Michael or Janet Jackson do their famous lip syncs. I've seen J.Lo do some syncing as well. I wouldn't let anyone do it, no matter how much the ratings may be affected by some singer missing the show. So what? At least I would have some respect for myself. Stupid lazy musicians.