The GIMP wiki has a page where the results of usability tests can be reported and discussed. At this point, though, the page just has instructions for constructing usability tests, but it doesn't actually have any test reports. This could be a cool course project!


It also raises the question
It also raises the question of whether we should try working with projects that have identified usability testing, rhetoric, branding, etc. as something they need to work on but for which the project's community either doesn't have the expertise or other resources or whether we should work with groups that haven't even begun to think about such issues.