I'm currently trying out a new font for the text editor in Visual Studio. The font is called Consolas and it is specially designed for use in programming environments and other circumstances where a monospaced font is required. The font is optimised for ClearType with proportions closer to normal text than traditional monospaced fonts like Courier. This allows for more comfortable reading of extended text on-screen.
Consolas is available in a special font pack for Visual Studio 2005 and 2008. You can download the font pack here.