I would love to remove this. I understand that this is currently not possible.
I'm willing to pay extra if required to remove these links. When embedding the forms on my website, the last thing I want to do is advertise for Adobe or have my competition figure out how I'm providing the service.
It seems wrong to me to have unwanted advert links for a service I'm paying for, but then again, perhaps I'm not paying enough. Please update features!!!!
In our release yesterday (1/16/2012), we removed the "Powered by | Term of Use | Report Abuse" footer for paid users (Basic and Plus) when the form is embeded within a web page (Distribute tab -> Embed)