Bitcoin

1. Currency exchanges

1.1. BTC-E

1.2. bitstamp

2. Stock exchanges

2.1. cryptostocks

2.2. GLBSE

3. Forums

3.1. bitcointalk.org

4. Ewallets

4.1. Blockchain

4.2. Instawallet

4.3. StrongCoin

4.4. Flexcoin

4.5. Easywallet

4.6. Paytunia

4.7. Walletbit