Banners and text links are nice and part of an affiliate program's marketing mix of content. What can set a program on fire is content developed as well for blogger affiliates, remnant ad buyers with private offers as well as promotional placement with large content publishers.
Building content for a program is imperative to success of an affiliate program. Consider having a page on your website dedicated to affiliate offers that the affiliates can gain access to to use as content in their blogs, websites, and newsletters. Custom content can be delivered specifically to private offer publishers who want a specific offer for their traffic base.
Creativity, and the quick response of your affiliate content and media development means your program can scale faster and increase sales more rapidly.