I was wondering how would you track a competitor's site traffic?

Tools such as Alexa.com are helpful but it does not show where the traffic is coming from. My intention is to find out where the traffic is coming from, which domains in particular.

Any ideas or suggestions?

You can ask them ;)

Unless they release it to the public, there isn't really a way for you to know. Alexa, for example, is just survey of the small percentage of internet users that use their toolbar; and thus not a accurate calculation.

www.hitwise.com apparently has good competitor intelligence.

however you will need a good $xx,xxx to spare to use their services. :)

Thanks for that nuthin, but its a bit too expensive ;)

Diaga, nobody is willing to give away their stats to competitors hehe so thats impossible too.

ANy other solutions?