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What software should every school computer have on it?

We are currently putting our 2011 computer images together for both out classroom and student leased netbooks and I am going through the process of adding and removing software and testing it before we deploy it to over 400 machines.

The big question is what do we put on them?  There are hundreds of great pieces of software available to enhance students learning both paid and free as well as some must have links to great sites foreducation.

So I would love to hear what suggestions you have and I then will compile that list together and possibly uploading the finished computer image as a downloadable torrent for all to share.  Please contribute below and tell us why you have suggested that piece of software.