[chriskelley]

Is there a canonical source for tracking the price of BTC? Would be nice to set up an alert for large downward swings to take advantage of lows without having to watch the ticker all day.

http://bitcoinity.org/markets seems handy for this.

[coconutrandom]

Take a look at http://live.bitcoinindex.es/ and http://bitcoin.clarkmoody.com/

[waterlesscloud]

The mobile app Bitcoin Paranoid lets you set up to get alarms based on certain percentage swings. Quite handy.