Hey Gang,
I've posted the slides from my talk to Slideshare:
http://www.slideshare.net/justatheory/releasing-postgresql-extension-on-pgxn
The first talk that I gave about 1/3 of is also on Slideshare, though the 9.1 stuff is no longer accurate. Still, for getting started with the basics, I think it's useful.
http://www.slideshare.net/justatheory/building-and-distributing-postgresql-extensions-without-learning-c
Best,
David