Ed Smith was thinking of working on sysctl documentation, but as it turns out, a lot of it has already been done via Google Code-In; Samuel Greear recently committed a lot of it. (Though there’s more sysctl work possible.)
While on that topic, Samuel Greear also posted a lengthy summary of all the Code-In work done so far. We need more code-related tasks! The existing ones have been so popular that they’re all getting done, quickly.