Bitcoinity is my favorite because I like the presentation it gives to real time bitcoin price charts.

Bitcoinwisdom is next on my list, and would probably be top if I was a professional trader because of all its trading indicator tools on real time bitcoin price charts.

Blockchain.info is my favorite block explorer, again because of its presentation, and also its online wallet's tools.

Bitstamp and Bitfinex are my final favorites because they are the top dollar/bitcoin exchanges.