I just completed a PSP 2.0 interface to my Japanese/English language education site. I don't think this would have wide appeal to the PSP community, but I thought I might mention it in case anyone has a curiosity with the language and wants to try it out. The system isn't complete yet, but is getting very close to an official launch soon (in particular, I haven't 'turned on' the vast majority of the course material). Also, note that you need to sign up for an account, but it won't cost you anything to use the lessons to learn some of the fundamentals (for anyone thinking of learning Japanese I highly recommend learning Katakana, then Hiragana before even learning a word, it will pay off later on trust me).
The emphasis of the system is for mobility "learn anywhere, anytime" and also there are some unique features in the desktop (windows and mac versions) which make it particularly useful for learning while you are in the office ;) I have grammar excecises and everything I will be sending live as well eventually.
By the way, the URL is www.lingolessons.com , and once you have an account you can point your PSP to psp.lingolessons.com.
PS. Mods, I was unsure where to post this message so if it's in the wrong place or is inappropriate my apologies.