Matz’s Slides at Ruby Conference 2002, OOPSLA2002, LL2 and O+F kansai(Japanese) are available.

Ruby Conference 2002
Slides: OOPSLA 2002 : Slides: LL2 : Slides: KANSAI OPENSOURCE+FREEWARE 2002 : Slides: LL2 slides in English to learn Japanese. :)