Webcomic archive software - simple administrative interface, lightweight and customizable. All of the common features of other online comics, plus some fairly novel ones (such as a calendar view with thumbnails). Please let me know if you use it!
I use it for a webcomic on a site I'm hosting, <http://caelonna.is-a-geek.net/comics/Sylvanus>. It was easy to set up, and easy to customize via CSS, and the RSS feature worked very well.