Intel has updated their suite of developer tools to include new and better support for OS X Leopard, encouraging developers to squeeze more performance out of the platform using their CPUs. The Intel C++ Compiler along with the Thread Building Blocks they began offering earlier this year have been updated, among others.
The updated compilers and other tools are intended to provide better APIs and newer functionality to take advantage of systems which have multiple cores, and these ones specifically for the OS X platform. This suite is actually fairly new, having been released a mere two years ago. Ever since Apple decided to switch from their traditional CPUs to Intel CPUs, developing for the Mac changed significantly, and it is good to see Intel encouraging further development.
You can read the full press release at Intel's site.