Welcome to WebmasterWorld Guest from 188.8.131.52
Surely, they must be spidering the page to get this information.
But should this really be happening?
I first thought that it was due to the GG Toolbar (with advance features on), but I turned them off a few weeks ago.
For e.g, if your file is in
you will see ads related to the keyword "design"
Try changing the folder name and see how the ads get changed. ;)