www.thestatistician.com
They show 'out' clicks and the count from sponsors. In defense of some of them (i.e. PornKings) they only count second page uniques, probably to give the illusion of awesome ratios.
When a sponsor is pretty close to dead on the traffic numbers I am pretty surprised. As you see some of them shave up to 40-60% of the total incoming hit numbers.
Here's a clue: if your incoming hits are not being counted, chances are they are losing cookie/referrer. That COULD mean they are being shaved, either globally or on your account directly (that's right, someone may not like you!). If the cookie/referrer does not track, ANY SALES FROM THOSE HITS PROBABLY WON'T EITHER. This excludes those 2nd page counting sponsors I mentioned, so make sure you check before you cry foul.
Sucks, but them's the facts of life.