Inheriting permissions in Sharepoint

After having spent several hours reapplying permissions and roles, I have learned the following about Sharepoint permissions in WSS 3.0:

1. Inheriting permissions and inheriting roles are not the same.
2. The Sharepoint GUI by default only breaks the permissions inheritance when you select "Edit Permissions" for an object or list.
3. Removing permissions from a parent site or object with "Remove user permissions" will delete that user's permissions from all child objects, even those that have broken the permission inheritance.

Seems quite unintuitive to me. So be careful removing user permissions from sites or really any object with children.

Here's more detail on the subject:

http://kjellsj.blogspot.com/2008/10/sharepoint-acls-roledefinitions.html