A page could be created on the main ubuntu.com site, and would include sections for "beginners", "experienced developers", etc. This page would have all the resources (or links to wiki pages) to get started developing applications for Ubuntu. Let's face it -- there is no easy guide to creating a simple package for beginning programmers, or guides that might be suitable for such a task. The page could also embed videos from the Ubuntu Developer's channel, and even host the Ubuntu Developer News (the weekly news for ubuntu devs).
It would certainly help improve the image of Ubuntu's development process and show that it is very active. The site would also make it more visible to mainstream developers (game companies, etc.), and it would also help to create a standard around Ubuntu.
Update - added a mockup (screenshot) over on my blog with a more complete writeup:
You can read the official plan here: