Adverlab points to an exciting new ad development. Bookmarkable ads that are also tools. Spongecell is offering ads that allow users to do widget-type things, like set a reminder for yourself about an upcoming event, sale, or expiration date. And of course share with your friends using the social media tool of your choice.
This is a cool trend, and could actually make banners that are purposeful. Together, we could change the world. One banner at a time.