Now that Barcelona is setting new levels of performance for x86-64 processors, you're likely to want to take advantage of every one of the many architectural innovations to boost your code beyond anything previously possible.
AMD, which has long maintained a deep inventory of developer tools and resources, has several key pieces of software to make burning performance possible.
This article looks at several useful tools and resources, all of which have the distinct advantage of being freely available. (The Resources section at the end of this article provides all the needed URLs.)