Me too: thanks for rewarding my laziness. The arbitrary class names make this job a moving target. Adding the selector `.ArwC7c a` gets link text playing along, too.
Absolutely great!!! Was thinking of doing this one by myself, and found this one while searching Google for the class name "ArwC7c". Thanks!! :) Note: the font for the composing text area is also changed, but only if you select the Plain Text one, not the Rich Formatting one. :)
EDITED: Feb. 19th 2008 To also apply the monospace font to Spell-checked text area (in fact a simple div), please add the class ".geTjV" to the list. Thanks.
Lou Quillio said about GMail 2: monospace font for non-HTML mails on Jun 15 2008
maxxyme said about GMail 2: monospace font for non-HTML mails on Feb 19 2008