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.

ac288178f5... Block 173604 (2012-03-30 19:29:26) 0.27091 Received: Address 0.27091
31944b14ec... Block 173606 (2012-03-30 19:55:44) 0.27091 Sent: Address 0