The official translation of Harry Potter and the Order of the Phoenix into German is scheduled to hit shelves on November 8. But at the Harry auf deutsch site (here's Google's English), a community has sprung up to perform a distributed translation. Every volunteer works on five pages, with the aid of a Potter-specific dictionary, and after turning in a German version, works on the prose to ensure it reads smoothly. In an unrelated effort, some schoolboys who did a Czech translation and posted it to a private website have been sued by Albatros, the Czech publishing house who will have the official translation out in February. Looks like Harry is crushing more than the Hulk.
Oh, and please don't post spoilers, it's still too early :)