I used to love consolas however I discovered while not as dense the serifs on courier new are superior. Glyphs in courier are not mirrored which makes it easier to read for people with dyslexia to read.
I spent hours trying to debug an issue where a certain string was not triggering an if-statement which looked like it should match. An "Oh" and a zero look virtually identical in Courier New. It is evil and must be destroyed.
A 0 is skinnier than an O or an o. I like the stroke in the consolas 0 but I still prefer the serifs of courier, prestige elite and UM Typewriter. I have spent a lot of time comparing for the best font on the wiki page for "list of monospace fonts." Courier is also W3 compliant.
