Thanks for the feedback everyone.
I agree that cookies are not 100% reliable, but other than an offer code it will be difficult to track sales on a product (courses / seminars, i work at a university) that has a little bit of a sales cycle.
David, Clicktracks sounds good, so does Urchin, which I believe does the same stuff, however I am locked into Hitbox pro and can not change now, or for the next year. It is a political thing. I also do not have access to log files.
Anyway, anyone have any thoughts on http://www.conversionruler.com/
? They have a seemingly good link tracker solution that can help me track conversions from different sources and campaigns. They use a cookie system that seems to act like adwords does. I have not seen a lot on the web about them though.
Any other vendors that do something similar? Any thoughts about conversioruler?