What are the tracking system out there is worth a try? Previously using in house log but it is getting more difficult as we have more campaigns from different source....Would like to know your recommendation! Thanks!
I use statcounter. It tells you the country of origin (useful for spotting click fraud), the actual engine and the exact term used to arrive on your site.
The best I've come across is in my sig. It packs a PUNCH for a low price; if you think you can install it onto one of your own webservers. It's not that bad either if they host it. They have a free trial.
There is also webstat.com, extremetracking.com, sitemeter.com and many more. If you don't need public stats, look also at http://www.google.com/analytics/
Are you referring to a traffic log, or a split-tester software? I'm assuming you mean you're wanting a script that will allow you to track where sales are coming from, what keywords are leading to sales, etc. I use www.adtrackz.com It's a simple script, but serves its purpose quite nicely. Brad