QUOTE(bohemian @ Nov 23 2005, 12:02 PM)

I call it cut common time but it still confuses me. Apparently the best way to tell it from 4/4 is by the speed and where the obvious divisions lie...

In my experience, it more often sounds like 2/4 with doubled note values than like 4/4.
Incidentally, the name "common time" is much more recent than the sign that looks like a C. The first time signatures were based on the circle, denoting a triple metre and known as "perfection" (because the circle is "perfect" and three is the number of the Trinity). The incomplete circle that became common time was known as "imperfection", and denoted a duple metre. Each of these symbols could have a vertical line through it, which meant that the unit was a semibreve, instead of the usual breve. Thus a circle with a line through it often meant (c. 1560) 3 quickish notes to a pulse, which many composers of the last 200 years would have notated as 3/4 or 3/8, with one beat to the bar.