It is a good news indeed.
Now decentralized blackmarket exchanges will emerge, protected by TOR and other anonymous networks.
And having legal exchanges like Mt Gox and Britcoin is also very important. I expect it to work like this:
Blackmarket goods <-> Blackmarket exchanges <-> Cash <-> Legal exchanges <-> Legal goods
BTC transactions "protected" by TOR can be trivially stolen by malicious TOR end nodes.
Uhhh.... like how? Bitcoin transactions are cryptographically signed.