i'm also in the process of learning japanese, i can read about 20 kanji now + the numbers... using the book method though, haven't tried this one yet coz i wanna have some basic grammar and understanding skills first in stead of just kanji...
I've been learning Japanese for a year now.. 4h class/week, plus one hour at home daily....I know about 150 kanjis + hiragana + katakana.
The only thing I can tell you guys is: "don't waist your time if you're not planning to go to Japan, this language is sooooo hard to learn, that's unbelievable !" It's estimated to be 5 times harder than english for speaking and 10 times harder than english for reading/writing.
I'm also expecting some DS stuff to learn Japanese, but I think that's not gonna happen.