The update you (and us too!) have been waiting for is finally around the corner. Yes, Zoho CRM will come under the Zoho single sign-on system this weekend. This will throw open the door for further integration between Zoho CRM and other Zoho services like Mail, Docs, Projects, Creator etc.
The maintenance window will be between 21st February, 2009 8:00 PM PST and 22nd February, 2009 8:00 AM PST. Zoho CRM customers will not be able to access the system during this timeframe. Our sincere apologies for any inconvenience this may cause.
This wiki page explains in detail the Zoho CRM SSO transition. Please feel free to post your comments on that page.