user1766: Do they have a client installed on their servers that pulls the info out of block headers? How does it do it? What's the command?

user575: Blockchain.info definitely has a client installed on their servers, that's where they get all the block data from. I heard they're using a fork of BitcoinJ.
In the Bitcoin-qt daemon, you can get the difficulty of the latest block with the getdifficulty command, and you can get complete information about every block, including the difficulty, with getblock.

1766: <p>Do they have a client installed on their servers that pulls the info out of block headers? How does it do it? What's the command?</p>
 575: <p>Blockchain.info definitely has a client installed on their servers, that's where they get all the block data from. I heard they're using a fork of BitcoinJ.</p>

<p>In the Bitcoin-qt daemon, you can get the difficulty of the latest block with the getdifficulty command, and you can get complete information about every block, including the difficulty, with getblock.</p>
