We are planing to remove publicimport.im URL from May 10,2011 onwards. Henceforth you need to use the  Remote Editor Service instead of publicimport.im. Hence we request you to migrate your Public Import implementation to be based on Remote API.

General Note about Remote API:

The Remote API allows for partner & third-party applications to make use viewing/editing documents of Zoho's Office applications (Writer, Sheet, Show) by providing a means for users to transparently upload their content from within the third party application.The key distinguishing factor of Zoho's remote API is that the data is totally under partner's control and the Zoho editor only provides an interface for viewing/editing the content.

Please refer the wiki page for more information https://apihelp.wiki.zoho.com/Zoho-API-Developers-Guide.html

If you have any specific request please send them to api hyphen support at zohocorp dot com