So if your regular landing page is
www.company.com/widget.html, then modifiy this in the AdWords interface to www.company.com/widget.html?referrer=adwords (example - any other appendix is possible). You can even fine tune this on a per-ad-basis:
www.company.com/widget.html?referrer=adwords1
www.company.com/widget.html?referrer=adwords2
www.company.com/widget.html?referrer=adwords3 If you later decide to go to another PPC, you can use the same technology:
www.company.com/widget.html?referrer=overture1
www.company.com/widget.html?referrer=overture2 Of course you do not need to call it "referrer". Another possibility is:
www.company.com/widget.html?ad=aw6 The basic structure is always the same though:
www.company.com/widget.html?variable=value Just make sure you keep track of which values you use for which campaign. I would advise you though to saty with the same variable name for all the campaigns - it makes it easier to grep the logs for that string.