Use Windows Vista fonts in Windows XP

Microsoft did change some of the system fonts in Windows Vista which tend to look cleaner and crisper than those used in Windows XP. It would not be legal to simply download and use those fonts in Windows XP but there is a way to get them on the XP system legally.
The free Powerpoint Viewer 2007 is installing several Windows Vista system fonts during installation which stay on the system even if the software is uninstalled afterwards. The cleartype fonts Calibri, Cambria, Candara, Consolas, Constantia and Corbel are installed into the fonts directory of the Windows XP installation.
You can change the font that Windows is using in the Appearance tab of the Display Properties. Just click on the Advanced button in that menu and select the element that you want to change the font for. You should see an immediate difference if you select one of the new fonts and have cleartype enabled.