I recently noticed that there is now a forum dedicated to xpages. Since the Lotus C API has been around since the beginning how about having a dedicated forum for it. This would simplify the ability for finding help for those developers trying to use some of C API options.
Just a few days ago I sent an email to the IP-Manager@openntf.org about creating a new project based off the custom CLASSNotesUserActivity library found in the SuperNTF project and at http://www.agecom.com.au/useractivity. Not sure how that is going to go, but regardless of whether a project is created or not I believe a forum is needed.