Guidance on preparing scientific posters

My colleague Eytan Adar recommends the following three resources to guide students on preparing scientific posters to communicate their research:
Advice on designing scientific posters, Colin Purrin, Swarthmore College (Eytan notes this is somewhat long, and he doesn’t agree with all of the advice).
Poster and Presentation Resources,UNC Graduate School (this is actually a collection of several resources from various others)
Tips for Posters in the Humanities, Stanford.