Have Your Japanese Corrected by Native Speakers’ Journal
On this LiveJournal site you can post some Japanese text and ask for corrections, suggestions, etc. Or use it to post a grammar/vocabulary question. I haven’t used it much, but a quick check looked like postings do indeed get quite a few responses so give it a try.
Source: “LiveJournal” | Subjects: Connecting (Groups, Forums, Language Exchange, Meetups, etc.), Language Exchange