I created a site that lets you view detailed information about Bitcoin blocks, addresses, and transactions.

http://theymos.ath.cx:64150/bbe/

This data is all gotten from the block chain. It has always been possible to get this data, but you had to patch Bitcoin with getblock or use the clunky -printblock switch in Bitcoin, and then you had to search through miles of data to get what you wanted. Now everything is available in a clickable and easily-searchable format.

Some highlights:

- The genesis block, which is included with every version of Bitcoin. If you click the only transaction in this block (the generation transaction), you will see that the "genesis coins" have not yet been spent ("not yet redeemed" in "outputs").

- 198.99 BTC has been donated to the EFF since a Bitcoin address was added to their site. (As of this writing. Hopefully more will be added.)

- Bitcoin Faucet has sent and received a ton of transactions. Because of the way change works in Bitcoin, the total balance on this page is not the actual Faucet balance, and this page does not represent all Faucet transactions.

- Surprisingly, the three transactions with unknown "to" addresses in this block are the only non-standard transactions in the block chain. The repeated OP_CHECKSIG commands cause everyone downloading the block chain to do extra cryptography -- the bug that allowed this transaction to be included is now fixed, but these old transactions still exist.

- 50 BTC has already been donated to BBE, even though I hadn't officially announced it yet. Thanks! If you click on the transaction and follow it back one transaction, you can see that the coin used to donate to me was a generation from January 2010.

- Following one of the addresses used by a scammer (according to BuyBitcoins), you can get all of the addresses that ever received coins from this address:
1PwQfGPUFfuqqsmqpg8GegKziMV5Y3qfyr
18oCRAYcQEFbgm7nUCnJ7CqfgYxrhj9Des
16Fdg74JrkWogNDLDM8FJS1k5QrKAouBts
12cPg8VXSL3R3GnphKbpabC14S1sZXbsmU
19w4JEHG2fjVkEeheLSQNTZmmj81KvSzK7
If you own one of these addresses, then maybe you can identify this scammer. This list is only going one level deep -- it's also possible to find a list of every address that received "stolen coins" from the original address, possibly through multiple levels.

I hope BBE will be useful and informative. One of my main motivations for creating it was to inform people of the exact limitations of Bitcoin's anonymity -- it's possible to remain anonymous, but only if you're careful.