Just stumbled across a form to sign up for Yahoo! Search Marketing’s BETA for mobile PPC adverts that we blogged about in early October. They have some nice images showing how it works. Like the Google version, you don’t need to have mobile content to participate.
I found it after reading on Reuters about Yahoo!’s announcement to trial slimmed down banner adverts. We assume that this is not for search results but other content. Let’s hope so anyway.