If a picture paints a thousand words..

One of SCIP's Directors works for Tactical Tech, an organisation based here in Brighton that provides information and support to NGOs around the globe.
It's most recent publication is a great free guide to visualising information - how to get your message across in pictures. It's not a techie guide but provides pointers and examples as the first step in preparing reports or flyers or posters.
You can download it from the Tactical Tech site
Visualizing Information for Advocacy: An Introduction to Information Design | Tactical Technology Collective