I just got Simplified Chinese running last week and it works great on the N810!

Here's my notes from a previous post:
Just wanted to say thanks as I was able to get simplified Chinese input (and viewing) working perfectly on my N810. I appreciate the info given here.

I used the simplified Chinese package at this CJK Support site.

Also for viewing only (no input support) for Chinese web sites, the font package from this site works perfectly too.

jfdaily.com loads correctly with the font package only. The Maemo CJK package allowed me to input Chinese characters into yahoo mail without any issues.

Hope this helps!