The Visual Computing Source is your holistic visual computing developer community providing all relevant developer tools, sdks, libraries, articles, videos, and forums.
Stop by and check it out at:www.intel.com/software/vcsource
Of particular interest to folks creating game demos would be:
The Graphics Performance Analyzers (Intel GPA): http://software.intel.com/en-us/articles/vcsource-tools-intel-gpa/- it will help you understand where in your code you can optimize performance with minimal or no impact to your visual fidelity.
The Intel Graphics Tech Samples: http://www.intel.com/software/graphics-samples - these graphics samples are created by engineers in our application engineering team (the guys who work with the big game companies) - to make it easier for the rest of the world to implement the learnings that they've made by working with the rendering pipeline on our processors using real code. These source code samples are free to download, use and implment in your own code.