"Recent Posts" widget... adding some space between each title?

First off, this theme is killer. But I'm trying to make a few small tweaks. I would like to create a single line of space between each title in my "Recent Posts" widget, which is titled "Recently..." on my blog: www.thirstyreader.com. The widget is in the left sidebar. I just feel that the titles tend to run together in the current format.

I'm sure there must be a way to drop a <p> in there somewhere to create some space, but I don't know where to begin!