I like the way they've arranged all the vocab, pronounciation, grammar links together for each language in a nice organised fashion.

I'm a little skeptic though of their classification of difficulty. I understand that they're categorising it based on English being a starting point, but after a certain level of proficiancy (what most people would classify as "intermediate" level), language learning just becomes a matter of constant exposure. I'm sure this would hold equally for both French or Japanese (apart from writing).