Hello,
I recently gave a talk about libbitcoin. You can see the youtube video here:

https://www.youtube.com/watch?v=_mMZls_c7JM

The slides are here:

http://www.slideshare.net/swansontec/libbitcoin-slides

Hopefully I didn't botch things up too bad. There are definitely a few
mistakes (bx has 81 commands, not 98, example). Still, this should be
a good introduction to the basic library stack.

-William