Wordpress.org an open sorce CMS provider using adwords. If you search for wordpress or wordpress related terms,their ads show. But why are they using it. update:They are redirecting it to their hosting plans..and they pay $100 + for getting customers....hahaaa...looks like a deal.. source:
Looks like someone is advertising webhosts rather than wordpress and they are using wordpress to get ur attention.
The ad takes you to a page reveiwing and recommending hosting for WordPress, so I would guess they have some kind of affiliate deal with those hosting suppliers. *checks again* - yep, they're quite transparent and say that "If you do decide to go with one of the hosts below and click through from this page, some will donate a portion of your fee back—so you can have a great host and support WordPress at the same time."