Nice statistics. Note that the number of BTC in transaction is less significant because people can send back and fro in short time. Instead it is better to show the graph of number of transaction vs time interval which will directly give information of the transaction waiting time distribution, which is expected to be Poison.

For the count page, the number of client is larger than expectation because its number should be of the same order of magnitude of miner, as they are always connect the the network, which should only be few ten thousand only. You may take a look of http://bitcoinstatus.rowit.co.uk/ which shows that there is around 50k. Counting unique IP is not a good method because it is easier to change it occutionally.