pavlovapete - 4:59 am on Apr 22, 2010 (gmt 0)
Attribution and tracking are very hot topics and there is an absolute boatload of articles and services around to help you solve the problem. You are not alone! :)
The service fuelurmind dropped (welcome to WebmasterWorld fuelurmind) is one of many businesses tackling the problem with dynamic phone numbers. ewhisper has mentioned these things to me before.
It isn't a blackhole - it just seems like that sometimes when you are starting out.
arieng's comments on last touch attribution highlight another burning debate in the PPC field.
Do some 3 or 4 word queries on Google using the terms that stick out to you in this thread and I'm sure you'll find heaps to digest. (Not permitted to drop links here)