I am a rookie in the Intel Developer Zone, but I was fortunate to have early access to Intel Xeon Phi coprocessors for some time. Now that Intel has lifted the Xeon Phi coprocessor's veil, I am happy to share my user experience and demonstrate some examples.
I have written a white paper investigating a toy model, the N-body simulation, on an Intel Xeon Phi coprocessor. The PDF file can be downloaded here: http://research.colfaxinternational.com/file.axd?file=2013%2f1%2fColfax_... . The paper contains code samples, assembly listings and performance results, and discusses some programming practices for the efficient utilization of the coprocessor. Most importantly, it demonstrates that a single C/C++ code can efficiently run on Xeon processors and Xeon Phi coprocessors. Mind that the performance results are obtained on a pre-production sample, and the specifications and performance of the final product may be different.
If this paper has some utility to fellow developers and scientists, I will be thrilled. I am also looking forward to discussions on this forum and learning about the experience of other people with Xeon Phi programming.