I'm in no way discrediting TradeHill.com - I use them all the time myself, and I think they are great. Just pointing out that if you are getting bargains there (or anywhere else right now), it is because of all the stolen coins.
Only in a very indirect sense. There's almost certainly a lack of liquidity at TradeHill - they're not much easier to get money into than any other bitcoin trading website, and a lot of traders have their cash stuck in MtGox - so that will almost certainly affect the prices.
(Also, I'm a bit twitchy because I've seen some really, really weird pro-MtGox posts in the last few days.)