I am now entering the Inetutils track with the intent of implementing IPv6 support where it is lacking. The first goal of mine is to deal with ftp and ftpd, then tftp and tftpd, respectively. So please inform me whether someone already is investing time here.
IPv6 support should already exist for the various daemons when used with inetd--I'm for any patches that remove the whole socket setup for all the daemons. The clients _should_ support IPv6, but some are lacking in that regard mostly due to not being able to read IPv6 addresses; e.g. the tftp client. Happy hacking.