Customized display of links

Hi,

I've been looking for a plugin that will do what I want. Haven't found it so far. Here's what I want to do. I have a bunch of Links set up in a few different categories. On a sidebar I'd like to be able to control how many links display in a given category. Specifically I want to show only the most recently added link. Anybody know of a suitable plugin for this task?

Thanks!!
Sharon