it was that moetan one from the "need japanese help" thread
http://www.moetan.jp (book site)
i would say its very worth it, its like the cutest book ive ever seen
it was like 1100 yen, plus 1500 or so for shipping, so like $24
not too bad for a book these days
its made to teach people english, so i think it would help with my japanese, since its in both languages.. that aside, it just looked hilarious and adorable
it has the 1000 most used words and phrases, such as "as long as i continue my hobby, i can't invite my girlfriend into my room"
plus its way perverted, the way a japanese book should be