When I first began writing, I didn't think too much about the font I used. A font is a font is a font. I've since come to my wingding senses and realized just how wrong I was!
When I started submitting stories I found instructions on margins, font size, and the font itself ~~ Times Roman, Garamond, Arial Narrow, one was supposed to use.
Take a look at the youtube abaout fonts. http://www.youtube.com/watch?v=i3k5oY9AHHM
After viewing it, you'll understand that each font has its own personality and you might think twice about submitting in plain old Arial Narrow! My personal favorite is Comic Sans who saves the day, er, fonts!