Dropbox is an innovative concept - as the tutorial video describes,
it is like having your own "magic pocket".
One place to keep everything on all your computers. 
Dropbox allows you access to all your files stored on any computer, from one location. It is perfect for teachers that work from multiple classrooms or who travel a lot (maybe like me, giving workshops).
With your dropbox account, you just sign in and access over the internet all your files. No tempermental "memory sticks", no carrying around a lot of memory cds. Everything at your finger tips online.
The only limitation is the free account which gives just 2Gbs of space. However, that should be enough for all but the most high tech, video hungry of users/teachers. Try it out, download and start using instantly! Get the users guide here.
