The classic game but with a twist: now you have to guide falling elements into the correct place in the periodic table. Play this as often as you can and you'll soon know which group and period the different elements belong in.
One best tools I use to keep information around me. This is even better if you are a iphone, itouch, or windows moblie user. Notes, webclips, can be emailed also can be tagged to keep track of these things. Desktop app and firefox add-on.