A hackintosh is a computer, typically a netbook with an Apple OS installed on it.  Wired did some tinkering and found that installing the latest version of Mac OS caused some improvements.  Specifically they said:

Here’s a rather odd little tidbit regarding Apple’s latest update to OS X. While it doesn’t bring many  new features to the Mac, consisting as it does of mostly bug-fixes, OS X 10.5.7 apparently gives a significant boost to battery-life on hackintoshes. Reports from the MSI Wind forums are claiming a boost up to 33%, from 3 hr 45 min to a shade over five hours, using a six-cell 4400 mAh battery. 

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