3fourty and someone else made points about the Russian not following TCAS, my understanding is we don't yet know if his TCAS operated, so how can we say that if they had both followed TCAS the accident would not have happened? When the tapes are sorted we will hopefully THEN be able to comment on this, at the momment there are just too many possibles:- both TCAS's went off correctly but the Russian followed ATC, the 757s called wrong, the Russian's did not work, the 757 called down then reversed/did not reverse/called for increased descent etc. etc.
Another point has been made about frequency changes, since the extra digit was added this has certainly got worse, maybe if we dropped the 1 off the front it would mean less to retain in your head while reading it back so better retention, ALL vhf frequencies start with 1 so it is not really needed - ie 132.475 becomes 32.475 etc.