I like Calibri too but isn't that an MS font? That seems just a little wrong to me...
QUOTE
Calibri is a humanist sans-serif typeface family under the Microsoft ClearType Font Collection.
In Microsoft Office 2007, it replaced Times New Roman as the default typeface in Word and replaced Arial as the default in PowerPoint, Excel and Outlook.
Calibri was designed by Lucas de Groot for Microsoft to take advantage of Microsoft's ClearType rendering technology.
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Availability
The typeface is distributed with Windows Vista, Microsoft Office 2007, and Microsoft Office 2008 for Mac. It can also be separately downloaded from Microsoft.
The typeface — along with Candara, Consolas, Cambria, Constantia, and Corbel — is also distributed with the free Powerpoint 2007 Viewer[1] and the Microsoft Office Compatibility Pack.[2]
The retail version of the typeface is sold by Ascender Corporation, as well as by Monotype Imaging in MicroType format as part of the Vista 8 Font Set package.
http://en.wikipedia.org/wiki/Calibri