user7433: How many coins been mined on the Testnet? 
How can I check how many coins have been mined? 

user5757: By visiting http://blockexplorer.com/testnet you can browse the testnet blockchain.
As of this writing, it shows that 128558 blocks have been mined on the current iteration of testnet (testnet3).  Since each block has a reward of 50 BTC (it has not decreased), that's a total of 6427900 BTC mined to date on testnet.

7433: <p>How many coins been mined on the <strong>Testnet</strong>? 
How can I check how many coins have been mined? </p>
 5757: <p>By visiting <a href="http://blockexplorer.com/testnet" rel="nofollow">http://blockexplorer.com/testnet</a> you can browse the testnet blockchain.</p>

<p>As of this writing, it shows that 128558 blocks have been mined on the current iteration of testnet (testnet3).  Since each block has a reward of 50 BTC (it has not decreased), that's a total of 6427900 BTC mined to date on testnet.</p>
