>> TwinVNC [...] works well with vnc4server (Debian). Including clipboard copy & paste.

> TwinVNC [...] does'nt support clipboard for now...

"Main features: [...] - clipboard support between client and server"
http://twinvnc.free.fr/index.php?menu=01&lang=eng
http://aminet.net/package/comm/tcp/TwinVNC0.8beta