ntop – 3.1 is out. Right now only the tgz are out, but according to the mailing list they are working on rpms also. Its not even on all the mirrors yet. Some changes are: virtual NetFlow/sFlow interfaces, new appearance, smarter memory usage, iSCSI/FibreChannel support, stability.
I’ve been using ntop for a few years now and look forward to upgrading to the new version soon.