Top of the list?
Access Google Docs & Spreadsheets in 14 languages
Now many of our friends around the world may access Google Docs & Spreadsheets in their native languages. We now support: Chinese (Simplified), Chinese (Traditional), Dutch, English (UK), English (US), French, German, Italian, Korean, Polish, Portuguese (Brazil), Russian, Spanish and Turkish. In addition, if you’re writing in a language that isn’t listed here, we have an additional 16 languages supported in our spell check to make collaborating around the world easy, simple and fun! Learn more
A little further down the page is:
Document spellcheck in 30+ languages
The document spellchecker is now improved and turbo-charged with more than 30 languages. Click on the drop-down arrow next to the highlighted “Check Spelling” link in the lower right corner of your documents to pick your preferred language from the list, then click on the link to check the spelling.
I’m a big fan of the Docs & Spreadsheets app and am glad to see it’s global reach is expanding a little further… So, anyone want to start a pool on how long it is until they roll-out real-time translation so authors who write in two different languages can work on the same doc at the same time? ;)