Very, very, very useful lesson.
I can recommend these websites to many people, along with using them for both myself and to help patrons.
Dial A Human: The best stress saver ever--tells you exactly what you need to do to reach a human being instead of being stuck in all those automated telephone menus for many companies.
Custom Guide: free quick reference guides to many computer programs. These may be useful to try with some of our library patrons that need a great deal of computer help.
Where is Your Username Registered?: I like how you can not only see if you can use that username, but remind yourself where you may have already registered accounts for yourself (or see who else really liked to use that name).