Google Earth Tours
Google Earth Tours are lots of fun, can be used in most subjects and across most age groups.
Obviously 5 and 6 year olds would make them WITH the teacher (who would do lots of the techie work) and 15 and 16 year olds would make their own (eg tourism, history, geography etc).
Check out this example from a Year 2/3 class and their holiday stories:
Where Room 8 went in the holidays....
http://glshamilton.blogspot.com/2010/08/google-earth-tour-where-we-went-in.html
Try this presentation for