MashUps

What are they? - http://en.wikipedia.org/wiki/Mashup_(web_application_hybrid)

a visual......http://bcc.janison.com/toolbox/frameworks/modulelibrary.asp?CourseKey=1&ModuleKey=1&NoLookup=Y&fcache=4.812814E+07

MashUp Tools

Big Huge Labs http://bighugelabs.com/flickr/
GoogleMaps
Voicethread - a tool for adding voice - http://voicethread.com/#home

Take a look at this mashup - http://www.bl.uk/onlinegallery/features/londoninmaps/exhibition.html

or Starviewer - http://keirclarke.googlepages.com/sky.htm

Voicethread