I'm currently studying Korean.

I just finished downloading all four Office 2003 MUI CDs, and installed Japanese, Korean, and Chinese (Traditional and Simplified) MUIs for XP and Office, complete with speech and handwriting.

It's great!  I use Word a lot now to test spelling/grammar, get simple definitions, find the Hanja (Korean for Chinese character) for a word and vice-versa, and so on.

I'd like to learn Japanese someday, but currently all I know I've learned from watching anime.  Even so, the Japanese IME is easy enough to use that I can type in (not knowing much Hiragana)  something I hear in a movie, and translate from that, right inside Word.  Very interesting.

With a digitizer pad, I can practise my Hangul (Korean alphabet) too.  Probably would have been more useful a while ago, as I can type Korean as fast as I write it now, and I'd imagine I'll soon be typing it much faster than I write (as it should be).