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How to Set Up a Killer WordPress Testing Environment Locally - Nettuts+
net.tutsplus.com: set up wordpress testing environment locally
If you're a heavy WordPress developer like me, you might find that you need to create a new installation for each site that requires a strange structure or specific posts, instead of using your uniform local test WordPress installation. Cue WordPress Mu. WordPress Multi User is a platform created by the geniuses at Automattic that is basically a WordPress installation that allows multiple blogs to run using the same software.
How to Set Up a Killer WordPress Testing Environment LocallyHow to Set Up a Local PHP/MySQL Development Sandbox for Windows and OS X | Build Internet!
Nice post on how to install a local server for testing purposes.