Default Visual Studio 2010 and 2008 font
In Visual Studio 2008 the default font is Courier New (size 10) but in Visual Studio 2010 the default font is Consolas (size 10).
You can see what it's set to in Tools -> Options -> Environment -> Fonts and Colors.
My Visual Studio 2010 is set to Consolas 10 as the default Text Editor setting.
The default font also depends on the language version of Visual Studio and the language of the operating system or the system locale. For example English VS 2008 on Japanese Windows defaults to MS Gothic.