For me it is easier to memorize vocabulary when it is spoken rather than written.
It is also so much more convinient to learn new words with an iPod or Mp3 player rather than having to carry around cards, books, notes...
It think it would be great if you released a weekly voabulary track.
First Japanese word than English translation. If there are several meanings add example sentences.
Grammar is important but to build up a vast knowledge of vocabulary is needed too.
A lot of Japanese study books have Audio CDs (only for pronounciation purpose though), but it is only Japanese without English translation.