Weird referrals = click fraud?

I am getting partial address errors from an unknown site.

[donok]

I started getting errors in my log a couple of weeks ago - people trying to go to trunkated page addresses (meaning, they don't have the full file name of a page in a link they click on). I went to the referring page and it seems to be one of these link-farm-like adsense pages -- someone has set-up a keyword-rich site for my keywords and has put links to my site along with my page descriptions in the body of their text in order to gain better adsense links.

I am getting about 40 clicks a day from these two sites: people clicking on their bogus links rather than the google adsense links on those pages.

Is this something I should be concerned about? Could this be a site that is using click fraud? Should I just take the extra 40 clicks and 401-redirect them to the correct page and let it go (free advertising for me)?

Any ideas? Thanks for the insight... Don

[toldan]

hm... Can you post example url what you get in your error files? E.g. do you have one IP# making 10-20 or more requests per second?