For translations from non-Latin scripts to English, I've seen people put up PNGs on Mechanical Turk, which seems hard to game--- OCR is usually bad for non-Latin languages, and people who don't know the script usually can't even retype it well enough to put it into Google Translate. Might not work well for alphabets that are easy to learn (Greek, Cyrillic), but if you put up a PNG of Arabic, you probably aren't going to get many non-Arabic-speakers who can do anything with it.
