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It is already decentralised in the sense that there are plenty of alternatives, and there are "over-the-counter" places like Bitcoin's #bitcoin-otc.

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I know that. But for some reason there is an extreme reliance on mtgox for price information. Even trades in -otc are usually based on the mtgox price. So maybe I worded it wrong, it's not so much trade that is centralized but the trade/price broadcasting.

Ah, I see. Well, there are some sources that aggregate data, like Bitcoin Charts:

http://bitcoincharts.com/markets/

Agreed. Still, bitcoincharts is a centralized site too, and could be DDoSed, overloaded, blocked, etc.

Maybe ticker/trade data could be spread over a gossip network as well. That's not as trivial as it sounds, though, for example how to check that trades are real and not just spam/manipulation. Maybe some way of authenticating exchanges by signing the packets (but then -otc would be left out... maybe their reputation system could be integrated somehow).

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