"Windows only: If there's only a few things most Microsoft Vista upgraders and nay-sayers can agree upon, one likely talking point is that Vista's fonts are generally clean, smooth, and a step up from XP. Getting the newer fonts in XP doesn't have to involve illegal downloads and system tweaking, however—as the gHacks tech blog points out, simply installing Microsoft's PowerPoint Viewer 2007 installs a bundle of Vista fonts in XP that you can use as your system defaults. Once installed, head to your display properties, then hit the Appearance tab to select a system-wide font. You'll also want to enable ClearType, which, luckily, we've covered before. PowerPoint Viewer 2007 is a free download for Windows only.PowerPoint Viewer 2007 [Microsoft via gHacks]"
But here's a simple trick to download the Vista fonts for free and legally without buying a Vista license:
Download either the free Microsoft Powerpoint 2007 Viewer or the Microsoft Office Compatibility pack - both the software include the new Windows Vista fonts.
Once you install the above Microsoft programs, the Vista Fonts also become available for use on your Windows XP system. The fonts are Candara, Consolas, Calibri, Cambria, Constantia and Corbel.