Here's the exact numbers:
July 2011 - 50,189
Aug 2011 - 51,042
Sep 2011 - 64,595
Oct 2011 - 40,943
Nov 2011 - 88,194
Dec 2011 - 63,431 (so far)

I think the domain switch from bit-coin-trading.com to bitcointrading.com as being the best decision I could have ever made.  And I didn't break the site in the process which is always a nice bonus!