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.

b3f8568dc4... Block 137969 (2011-07-25 13:39:14) 1.424 Received: Address 1.424
3998dc21d4... Block 137969 (2011-07-25 13:39:14) 1.424 Sent: Address 0