Simplelist is a simple method of getting lists of content to display in pages or blocks on your site. It doesn't try to do everything, instead it relies on node_load to pull in node data and node_view or a theme function to display it. As such, it doesn't require any special coding to use a custom module with Simplelist - it just works.
For example, you could create a block to display 10 images in order of highest ranking or most recent comment, or create a private page containing all nodes submitted by a user in a particular role.