We’ve had numerous requests for banner ads to help promote Listia on your favorite web sites, blogs & forums so here you go! There are two sizes right now, 468×60 and 120×240. We’ll be making a few more in the near future and might even take some user submissions =) Feel free to email us if you’ve made something cool.
To find all of these visit (be sure to be logged in): http://www.listia.com/account/referral_tools
The Listia Blog 
I used them on my 5 or so sites already. Nice job on the artwork!