Tim, a friend of mine from grad school, recently created an awesome iPhone app called Flash of Genius. Flash of Genius (which is also the name of his startup) is an SAT vocab prep tool. Nothing special, right? Wrong. Here’s a bit about how they describe the application:
Other vocabulary programs treat each word as totally unrelated to each other word. But we understand that you learn and retain words best when you make connections from those you already know to the ones you’re struggling with.
Essentially, the application recognizes that people think in terms of connections, such as word roots, and it therefore shows you how words relate to each other (like how colloquial and eloquent are related, and should therefore be taught together). This is ambrosia for word nerds; show it to every high school student you know.