It's been six years since the announcement of the PowerPC to Intel transition, and with OS X Lion Apple has basically said, "Enough is enough," and relegated Rosetta to the software dustbin. The PPC-enabling code translation technology, Rosetta, was an optional install for users who still needed the ability to turn PowerPC instructions into something the newer Intel processors could execute. Wisely (for the time), Apple kept support for PowerPC software as an option for Mac users running Snow Leopard. In 2009, Mac OS X Snow Leopard moved to Intel-only hardware and dropped legacy support for PowerPC Macs. Before upgrading to Lion, it's important to know if you have any of these apps still hanging around, because they'll be useless piles of ones and zeros afterward. However, there is a certain older class of application that won't even open anymore once you install OS X Lion: PowerPC-only apps. Most programs put out in the last few years should at least launch in Lion, though it may be some time before they run well. If you have a lot of older programs hanging around on your Mac, chances are some of them may not work correctly (or at all) after upgrading to OS X Lion.
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