Just a quick note that vsftpd-3.0.0 is imminent. The big-ticket item is the new seccomp filter sandboxing support.
Please test this, particularly on 64-bit Ubuntu Precise Beta 2 (or newer) or if you use SSL support.
I would love to get a quick note (e-mail or comment here) even if just to say it seems to work in your configuration.
https://security.appspot.com/downloads/vsftpd-3.0.0-pre2.tar.gz
https://security.appspot.com/downloads/vsftpd-3.0.0-pre2.tar.gz.asc