CoinNotify is a nice and simple Bitcoin Ticker for OS X. It supports multiple currencies and exchanges and makes easy following the Bitcoin price.
Currency support: BTC/AUD, BTC/CAD, BTC/CHF, BTC/CNY, BTC/EUR, BTC/GBP, BTC/HKD, BTC/NOK, BTC/PLN, BTC/RUB, BTC/SGD, BTC/THB, BTC/USD, LTC/BYC, LTC/EUR and LTC/USD.