I’ve always thought that the Typekit colophon badge was kinda cool. Its small, unobtrusive and lets users of your site know what fonts you are using. I thought it would be neat if something similar could be made for Akismet. You could have a little badge at the bottom of your site letting people know that you use are a proud Akismet user.
You could set it up to show your stats or you could just provide a link so people could get some more info on Akismet. I through together a quick & simple badge and put it on my site so you can get an idea of what I was thinking with this.