An interesting demo on .NET parallel programming
C9 Bytes: Parallel Fx using Ray Tracing with Stephen Toub
Stephen Toub, a Program Manager on the Parallel Fx team, demos how to get 400+% performance increase in a CPU intensive Ray Tracing program by switching one line of code from a regular for loop to using the Parallel.For command.
reference
Designing and Building Parallel Programs, by Ian Foster