BSD license is good. It requires that your copyright notice be included with any derivative works - but otherwise lets users create and distribute derivatives how they see fit. The version I use is at http://www.voidspace.org.uk/python/license.shtml (which links to the version at the OSI).
The MIT license is even *less* restrictive. I would use one or other of these two. All the best, Fuzzyman http://www.voidspace.org.uk/python/index.shtml -- http://mail.python.org/mailman/listinfo/python-list
