Here's a document of Marketo's internal Program Channels, as of May 2012. You may want to look at it for some inspiration!
http://community.marketo.com/MarketoArticle?id=kA050000000L5zf&src=
My biggest tip would be to make sure that you and your team agree on what "Success" means for each program. Also create templates for each program channel to ensure that they are used accurately and consistently.