Google forbids publishers to click on their adsense links to find out the destination URL (the website that an ad link will ultimately lead to).
What you can do are the following (according to the adsense help pages):
Solution 1: Use the Adsense Preview-Tool
Problem 1: This is IE 6 only. I work on a Mac, the only IE version I could use is 5. So, no solution for me. (And even on Windows, do you still use IE 6?)
Solution 2: Look at the ad URL and find the destination URL after "adurl=", e.g. in "http://www.googleadservices.com/pagead/adclick?adurl=http://www.example.com&sa=..." the destination URL is "example.com".
Problem 2: My URLs don't have "addurl=" in them and don't contain any URLs at all except the one to my own website. Here is an example, copied unchanged from my site:
http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-aaa&output=html&h=90&slotname=8872024742&w=160&lmt=1266406764&flash=10.0.32&url=http%3A%2F%2Fwww.example.com%2F&dt=1266406764800&correlator=1266406764805&frm=0&ga_vid=716470261.1266406765&ga_sid=1266406765&ga_hid=1706496355&ga_fc=0&u_tz=60&u_his=1&u_java=1&u_h=1200&u_w=1920&u_ah=1174&u_aw=1920&u_cd=24&u_nplug=9&u_nmime=119&biw=1276&bih=1029&ref=http%3A%2F%2Fwww.example.com%2F&fu=0&ifi=1&dtd=139&xpc=IJnJCkSORC&p=http%3A//www.example.com&rl_rc=true&adsense_enabled=true&ad_type=text_image&height=90&width=160&format=fp_al_lp&kw_type=radlink&prev_fmts=160x90_0ads_al&rt=ChBLe9VsAAvmYgrMiUNeU00OEhFGdW5ueSBDb21pYyBTdHJpcBoI3auoJ7O3K3soAVITCKP_6-qk-Z8CFQ6IzAodOgE47w&hl=en&kw0=key+word&kw1=key+word+one&kw2=two&kw3=key+word+three&okw=key+word+four
So it seems that I cannot find out the destination URLs of Google ads on my site, which is, in my eyes, unacceptable.
Unfortunately I cannot even ask anyone to visit my site and click on the ads and then send me a PM with the URLs of the pages they were led to, because even asking another person to click on the links is breaking Google's rules (so please don't do it!).
But what can I do?
[edited by: jatar_k at 3:06 pm (utc) on Feb 17, 2010]
[edit reason] removed specifics [/edit]