My son suggested I end the year with a “Best of…” column, pointing out how quickly I could write it (since they are out of school). But choosing from the more than 200 Web sites reviewed this year was a difficult task. I chose these five not because they scored the most points on a rigid grading scale, but because they represent the many things that make the Internet a great educational tool. Each is compelling in its own way, and for its own reasons. Have a great New Year!