Have a look at http://www.save-the-delta-queen.org/promotion-material/

You'll find the Save the Delta Queen logo in high quality for download as well as a printable flyer (thanks to Jon Tschiggfrie!) and the code for banners you can add to your own website.

Also I've added a bumper sticker to the steamboats.org Cafepress shop, and feel free to print your own bumper sticker - the sticker is also available in the Promotional Material page for download.