There is a paper of one of (I hope) Mizar members Grigory Ivanov in the 1st 2004 Mir PK (PC World) issue - obout TeorMat - a program teaching theorem proving.
You can visit its site
http://math.fizteh.ru/teormat
C Новым 2004 !
С уважением
P bI K O B B. B. MOCKBA
Vladimir Rykov, PhD in Computational Linguistics,
MOSCOW
http://rykov.narod.ru/
Engl. http://www.blkbox.com/~gigawatt/rykov.html
Tel +7-903-749-19-99