We have been strategizing the best way to start creating ads and are looking at 3 possibilities - a plain text ad (in between the search results), a "featured" Keyword specific ad at the top of the page and also a popup ad in some cases.
These ads are to be broken down into specialized groups, called "Special Interest Groups" (SIGs). This way, the ads are more focused. Getting and guiding people into SIGs is an essential part of Zabang.
We are currently experimenting with different options and creating the user interface for managing this important feature.