Overlapping Circles

Given a pre-existing set of circles and their data, how would you generate another, random set of circles none of which overlap the first set of circles? Is there a more efficient way to do this than a guess-and-check method?

This sounds much like a circle packing algorithm:

http://nodebox.net/code/index.php/shared_2008-08-07-12-55-33

Is this what you mean?

That link you provided fdb is what I'm trying to accomplish.
I've downloaded the deluanay module and added it to the library, even to the folder where I'm running the script, but to no avail.

I get the following error:
(I am using Mark's code from the packing circles thread)

Traceback (most recent call last):
  File "nodebox/gui/mac/__init__.pyo", line 358, in _execScript
  File "/Users/enrique/Library/Application Support/NodeBox/libraries/delaunay/test.py", line 1, in 
ImportError: No module named delaunay