6x13 - the classic xterm font. Its claim to fame is that it is 6 pixels wide, where the smallest useful size of Lucida Console is 7 pixels wide. Using 6x13 an 80 column terminal or editor window is 480 pixels wide plus scrollbars and window borders. This means that a 1024 pixel screen is wide enough for two editor or shell windows side by side and a 1600 pixel screen is wide enough for three.
While 1024 pixel screens are a bit outmoded on PC's these days they are widely found on netbooks. 1600x1200 screens are widely used on PC's, so this font has a couple of sweet spots depending on what type of screen you have.
A windows version can be downloaded here. There are also several 6-pixel wide X11 fonts that are less than 13 pixels high (often named 'clear'), so you can get more lines on the screen. However, I've never seen windows .FON conversions of them. Note that these are bitmap fonts and while fairly frugal with screen real-estate they are not scalable and do not support antialiasing.
P.S. having said that, I'm using Lucida Console on Windows at work, although I have two 1280x1024 screens which are wide enough for it. Lucida console is not quite as tall as 6x13 so it gives more lines for a given number of pixels vertically. At home I have two 1600x1200 displays and use 6x13 on Linux and Lucida Console on Windows for Visual Studio.