Identifying clicks from Overture partners

How is this reported?

[fom2001uk]

Haven't done any Overture work yet, but when I do, I expect to be able to see which partner sites delivered the clicks.

Can't see any details on the Overture site, so can someone confirm that this is indeed reported?

[fom2001uk]

Looks like they don't report it.

WebTrends will pick it up though (track the referring site before the click), even if the number don't agree with Overture's ;-)