What are the main bitcoin exchanges in the U.S.?

[romanix]

There are plenty of bitcoin exchanges in Europe (bitstamp, btc-e, HitBit, cryptonit, nextcoin, ...) and Asia (itBit, Bitfinex, ANX, ...).

But what are the main U.S. based bitcoin exchanges besides kraken and coinsetter?
(And coinsetter seems to mainly duplicate bitstamp orders ...)

We'd like to add more north and south american bitcoin exchanges to our realtime aggregated bitcoin orderbook and order them by best price.

http://www.orderbook.info/

Input welcome !

[ShakyhandsBTCer]

Coinbase is technically a broker, but there is coinbase.

Bitstamp is another big one.

You also have camp BX.

Localbitcoins is also technically just an escrow service, but they are good for decentralization of trades.

[RepublicSpace]

CampBX
Coinmkt
Litetree
Kraken (but they don't trade in USD in all 50 states yet)