I didn't take typing in high school, I learned to type by using the computer. So one space is normal for me. Most internet message boards will take the extra space out anyways.

The major problem I have run into is: I'm in college now, and most professors are OK with one space after a period. However, my English prof last semester insisted on our work having two spaces after a period. I found a way to force Word Perfect to do that for me (I can type one space after a period, WP will automatically add another one), but I haven't found a way to do that in Word. I honestly have no preference, one space looks normal to me because books only have one space after a period. Picky professors drive me nuts!