I'm very happy to announce the result of a lot of work that dramatically improves the Kindle edition of Instapaper: periodical formatting. […]
Tapping left or right on the [joy]stick… quickly switches to the previous or next articles, respectively. No more moving the cursor through the page for navigation links.
Nice. This takes care of one of the two things I've been clamoring for, and makes reading Instapaper'd articles on the Kindle much more practical (and much less annoying).