I love the idea of creating a Google Earth tour of a city or country as part of a social studies unit.
As students observe their world in creative ways, they can utilize technology to record their explorations. They publish what they have seen and learned so that others can collaborate with them and share experiences.
they can harness the web 2.0 technologies to share their experiences with a larger, global audience
This Web2.0 site reminds me a bit of Diigo, but it allows me to create a trail of sites for students to visit and to add sticky note comments to each site, sort of like a virtual field trip with notes.