Drupal

Am currently engaged to deliver a Drupal solution, which would greatly benefit with some Zoho functionality. Having spent some time evaluating Zoho in order to determine best integration practices; I'm still not sure whether this should be attempted.

Has anyone tried integrating the two? Even if its not at a deep SSO/role/group management level, are there any work-arounds you would recommend? Care to share your general findings if you have already been down this road?