Saw a similar one two days ago... Noticeable but not as bad as the one in the post.

This one seems to be the same "layout" ... doesnt it?

http://alexvega.es/115/mas-pruebas-de-adwords

depends on font-size, window-width....

Looks like the right unit sits 'on top' of the results. I get the same thing if I get a coop onebox result that has a sponsored add above it.