1.  MtGox has a pretty good handle on this incident and they do not seem overly rattled for a lot of reasons. 
2.  All those in the government and other big business who keep talking about BitCoin being of no concern are obviously very concerned.
3.  Dwolla lacks balls and/or a legal department.  (Not sayin' they could have avoided this based on the US laws but...).
4.  This isn't gonna stop any time soon.
5.  A truly decentralized crypto-currency needs to find a way to work around these concerns.