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.

a272b055c4... Block 146976 (2011-09-26 14:26:45) 84.9 Received: Address 84.9
b6599180e7... Block 147060 (2011-09-27 05:05:46) 84.9 Sent: Address 0
d97a317b2d... Block 147556 (2011-09-30 22:07:40) 28.87 Received: Address 28.87
a626ea81d3... Block 148083 (2011-10-04 23:03:23) 28.87 Sent: Address 0