I presented this talk August 28, 2013 at the YourTalentAgents.com Emerging Technology Series.
This talk covers the history of Bitcoin and the technology that makes Bitcoin work, including the mining workflow (hashing, block propagation, forks, etc.) and transaction workflow (signing, propagation, etc.). It also briefly touches on altcoins such as Litecoin and Namecoin.
A video of this talk is available here:
https://www.youtube.com/watch?v=aGTRPhTiiXU