http://www.howstuffworks.com/ is a great site for technology.

Windows explorer is fine but here’s a new idea. Google has developed a desktop search for all your computer files

Need a word a day, book, newsletter
This is a UK site but math’s sites are always useful. This one can help you, the teacher or your students
http://www.10ticks.co.uk/

Intouch is a Microsoft specialist consulting company. There are some free tutorials and tests of your computer knowledge however.