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.

72ea1fcb46... Block 177803 (2012-04-29 19:49:22) 50 Received: Address 50
9cf307d959... Block 178082 (2012-05-01 10:53:43) 50 Sent: Address 0