Just a quick note here to urge you to check out a new site called Phylopic. It's a project by T. Michael Keesey, and as he writes at his blog Three Pound Monkey Brain, it is an open database of Creative Commons licensed silhouettes of all sorts of organisms. It's going to be useful to folks who put together diagrams and other graphics for science communication, and it needs contributions! This is a great way for artists and designers to pitch in and help scientists improve their visuals and make the process easier. Check it out, spread the word, and pitch in.