Leaving the place a little better than you found it applies to projects too. Documentation is one of those things that slips between the cracks, and keeping documentation readable, usable and easy to update is what separates good projects from great ones. Documenting the Digital Fact Tag on internal documents (similar to a wiki) at Microsoft needed a styleguide for whitesheet documentation. A short project of 1.5 days, this guide made it easy to keep all the content organized and looking nice.