Is there any way I can use AWstats to track actual conversion rates for PPC campaigns ?
Well, you can track hits from a PPC campaign, but I wouldn't know of a way how you could track conversions. Unless you have a cookie system that adds a specially crafted request to the logfiles.
The problem is that awstats needed to keep track of every single session and see if a hit that came through a campaign and that started the session also led to a conversion (=> most of the times look for a HTTP POST).
The problems you will be confronted with are the following:
Ususally using the PPC supplier's conversion system (as offered by Google, Overture, etc.) is the better method of measuring success. However, even with those system you won't be able to conversions from customers calling or writing an email instead of using the webservers shopping system.
Hey thanks ... guess I'll have to look for a specific conversion tracjking script to do this job
Have a look at Google's conversion tracking system as an example: