Finding connected addresses has become MUCH easier with my latest tool.  Please take a look at my post here: https://bitcointalk.org/index.php?topic=103609.0

Here, as an example, is wikileaks public donation address: http://blockviewer.com/#/owns/1HB5XMLmzFVj8ALj6mfBsbifRoD4miY36v.  It can be seen that over 90 addresses have also been connected to that single address.  Be sure to click on the owner node and see where wikileaks has received money and where it has sent money.

If you would like to try it yourself, plug in an address and under search hit "Owner Address" to see if your address has been added to what I call the owner network. I just launched this application like 2 days ago, so please forgive its "roughness".

I'm happy to answer any questions!