No we dont officially support Safari yet, but if you still want to use Zoho apps in Safari, there is a way to do it.
Download the latest Webkit from Webkit.org and use Safari that comes with it. You’ll be able to use Zoho Writer, Sheet and other apps as well (though we say we dont support safari yet). I have been playing with it for a few days and I didnt face many issues apart from some minor ones.
Interstingly, the version of Safari that comes with Webkit is the same (including the build number) as the version I had on my Mac.
We plan to support Safari after Leopard release.