Perhaps ikiwiki should support XML-RPC-baed blogging, using the standard MetaWeblog protocol. This would allow the use of applets like gnome-blog to post to an ikiwiki blog. The protocol supports multiple blog names, so one standard URL with page names as blog names would work.
This would be a great thing to add a plugin for. (Probably using the cgi hook to let ikiwiki act as an RPC server. --Joey