Hey BitcoinTalk,
To get a comparison of market size, I've always used BitcoinCharts to compare how well the exchanges are doing as well as the wider market. Being new to the game, coin base is not yet listed.
http://bitcoincharts.com/markets/currency/USD.htmlDoes anyone have a daily breakdown of how much trading volume they do in comparison to the other exchanges? To me it roughly looks like they're currently #3 behind Bitfinex and Bitstamp and quickly rising. Would be good to get some solid figures to back this up though.