In my never ending quest to provide metrics that I believe people will need. I added this:
Bitcoin Exchange Spread = $7.38
It's simply the average spread between the exchanges, Recently with the massive fluctuations in price (generally big increases) I have seen CampBX , MtGox and others trading several dollars away from each other.
Earlier today the spread was nearly 9 dollars. Which means that people were buying bitcoins (at the time) 9 dollars cheaper on CampBX than they were at Mt.Gox (vice versa, people were getting paid 9 dollars more on MtGox than they were at CampBX).
http://www.ounce.mePlease tell me if this is helpful.