http://qs321.pair.com?node_id=378899

It took me a while to figure this out, and I couldn't find it documented anywhere, so for the benefit of other people:

Here's how to add a link to "Nodes You Wrote" in your Personal Nodelet.

Go to your User Settings, and in a new link field, enter <a href="?node_id=6364&user=gaal">Nodes You Wrote</a> (together with all the HTML. Also, obviously, you should substitute gaal with your username.) Press submit. That's it, you're set.

(Thanks to beable for the hint.)