"Pipeline" Generator presentation - where?

[Sean DiZazzo]

I remember reading (a few times) a presentation about using generators
to create "pipelines"  The idea was to create very specific and small
generator functions, and then combine them together to get larger
results.  The example used was to parse log files contained in gzipped
log files among other things.

I'd love to read it again, but I can't find it!  Can somebody please
point me to it?  TIA.

~Sean