Here is a cool idea...PodGuides. I have heard of museum's using iPods for audio tours before but this is a site that has some samples and offer other ideas. It has incorprtated a pdf map of the locations and when the audio is playing a picture of the site/painting/or whatever the tour is about, is shown in the album art area.
This could have some cool applications in education. Perhaps having students make a PodGuide of their neighorhood, or battlefields, or atwork, or their school for newbies.
This site offers not only the free guides themselves but free software for multiplatforms that makes the guides. Here is a screenshot of the application.