There was an unaswered question on these boards, but I have the same one:
Is there any option other than using the XML-RPC interface for allowing end-users to manually register themselves (i.e., workaround the Spark “service icon-based” registration? For example, is there a URL to point them to?
The manual registration for the IM Gateway users is great for admins, but not good for security conscious companies that won’t ask their end-users for their AOL, MSN, etc. usernames and passwords.