We will soon be carrying education computer programs. They have everything from math games to typing tutors. In addition to the programs you can get for free or very cheap from softseek, I would like to recommend a few computer games that your kids won't even realize are educational. You can find these on-line from most computer stores, or you can obtain them at your local computer software store.
Civilization -Build a civilization from prehistoric times.
You must ensure an adequate food supply, choose inventions to work on, fight battles, and hopefully be the first civilization to make it to Alpha Centauri. The only bad thing about this game is that, for kids and adults alike, it is very mesmerizing and difficult to stop, so I might recommend setting a daily or weekly time limit. One game takes 5-10 hours to play. Of course, you don't need to do it straight through. Sim City -Create a city from the dirt up.