I'd think the most reasonable approach would be to have the frameworks reference the module.
Myghty doesn't require an API, as the names are just imported and attached to a template global helper object, ie, <% h.observe_field(.....) %>. TurboGears may likely require a bunch of API's for the various template languages Buffet support, I don't know offhand. For those cases, I'd have no problem including the API glue in the RailsHelpers repository since it makes little sense to have yet another package that just contains that API glue.
