I think a good idea for the learning center in reference materials would be example sentences. What I mean by that is taking Hiragana and/or katakana and even kanji and putting the ones you are currently trying to master into example sentences with an english translation. In my opinion, one of the best way to memorize characters is to read them. That's why I bought the japanese version of Pokemon Red Version, or as the Japanese people call it "Pocket Monsters Akai Version". Anyways the best way to learn something like that is to just start using that skill right away.
-Shumiston