Note: While the last "balance" is the accurate number of bitcoins available to this address, it is likely not the balance available to this person. Every time a transaction is sent, some bitcoins are usually sent back to yourself at a new address (not included in the Bitcoin UI), which makes the balance of a single address misleading. See the wiki for more info on transactions.

54923a16cd... Block 174561 (2012-04-06 20:39:25) 49 Received: Address 49
f6849746d0... Block 177546 (2012-04-28 06:38:04) 49 Sent: Address 0