GRDDL presentation

Hello,

I am going to make a presentation concerning GRDDL and the Jena GRDDL 
Reader, at the Jena User Conference:

http://hpl.hp.com/conferences/juc2007/agenda.html

For this, ideally I would like about 15 or 20 mins worth of introduction 
to GRDDL, that I can copy (with attribution).

Are there some appropriate presentations and/or material on the Web?
(or that could be e-mailed me)

[Obviously the primer and the use cases docs - also WWW 2007 stuff??]

thanks

Jeremy
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