It was "down" for some weeks ....

www orderbook.info is back!

It shows aggregated BTC price feeds from the following bitcoin exchanges sorted by best price and with synthetic calculated spread.
Don't be surprised if you see negative spreads a.k.a. inverse prices. For bitcoin that's rather the normal case.

Integrated exchanges:

• Bitstamp
• btc-e   
• Kraken   
• Bitfinex 
• itBit   
• ANX   
• Okcoin   
• LakeBTC   
• Coinbase   
• Livecoin
• Gemini

Feedback welcome.
Yes, we currently lack Poloniex.