Ilya Konstantinov is patching rdesktop for better clipboard, including Xfixes notification support (which seems like a good idea), Unicode support and probably a commandline option for selecting if only CLIPBOARD should be polled, or if the current behaviour (first PRIMARY, then CLIPBOARD) should be in use. This will probably be good stuff, and we should use it, especially since our work will be limited to testing and applying patches.
Ilya is working on this _now_, so we need to do the helping work _now_.
Ilya has submitted a new patch, see https://sourceforge.net/tracker/?func=detail&atid=381349&aid=1394324&group_id=24366.
Patch pointed at in comment#2 applied.
This is finished ages ago.