About mblock programming

Hi,

I found a slide talking about the mblock programming in GNU Radio
http://www.google.com/url?sa=t&source=web&ct=res&cd=1&ved=0CAcQFjAA&url=http%3A%2F%2Fentropia.de%2Fwiki%2Fimages%2F9%2F91%2FIntroduction_to_gnuradio_programming.pdf&rct=j&q=mblock+gnuradio&ei=1jHrSvChDY3jlAeRkomABQ&usg=AFQjCNE842oQ7gg30X1oTJYFq9ghbejWsw&sig2=qPU-KLHtIf0VO2MlAoppNw

It seems that it is quite different from the python flow_graph
programming
method. But the slide talk so briefly. Can anyone give some suggestion
on
the mblock programming or share some material on it?,

Thanks

Chen C.