Set Leading to the Font Size

Here's a quick way to set the leading (the space between lines of type) to the same size as the current font size: Highlight your text with the Type tool (T), double-click on the Leading icon in the Character palette (just to the left of the Leading field). Just in case you're interested, equal font and leading sizes is known as solid leading, and it works best when your text is in all caps, so there are no descenders to bump into the type below.