I am familiar with Wikipedia Loves Art
a photography contest among museums with the aim of illustrating Wikipedia articles. But I am curious as to what (if anything) museums have been doing to add information to topics of their expertise in Wikipedia. The Minnesota Historical Society has been illustrating Minnesota topics with images from it's collections as well as adding information to relevant Minnesota topics
For a small museum Wikipedia is a great way to get out information to the public on topics important to their organization and have a ready-made community make contributions, corrections and additions.