This is a talk I gave in April 2011 as part of the 2011 Museums and the Web (MW) conference in Philadelphia. Image credits are included at the end of this presentation and there is a PDF version with speaker notes (17MB) available for download. The full paper that this talk is based is available from the MW site. (Also, this blurb will go away once you move on to the next slide, either by clicking the next and previous links below or using the arrow keys on your keyboard.)