Google Referral in Logs?

Trying to figure out what this referral is in the log files

[richardsi]

I've been trying to get an answer to this to no avail... I was looking through referrals to a site and saw the following referral in the logs:

pagead2.googlesyndication.co...00x282&random=1 (clicking on the link goes nowhere)

I understand that this is a Google referral, but what I'm trying to figure out is what type of referral? Is this an AdWords referral, or an AdSense referral, or a referral from the Google-powered web search on the USA Today site...

[quotations]

Is this an AdWords referral, or an AdSense referral,

Yes. It would typically be someone clicking on your Adwords ad on an Adsense content site.