Links of interesting for the development of Bitshares

[santaclause102]

I'd like to start a topic where everyone can post links he/she thinks could be of interest for all us here and in particular for the Invictus team for expanding on / improving aspects of Bitshares (=no off topic links)

I'd suggest the following format along with a few links:

On the implementation of data feeds:
http://gavintech.blogspot.com/2014/06/bit-thereum.html - Gavin Adresen about a way to do smart contracts with Bitcoin by making use of data feeds and ways to implement it. 
https://www.realitykeys.com/   - service providing API s for data feeds of all sorts.
https://github.com/orisi/wiki/wiki/Orisi-White-Paper - a project along the lines of Andresen's suggestion.