I just spotted this spreadsheet that Mark Arend has posted.
The Sharepoint 2007 permissions matrix is a great reference of the out of box permissions and how they map to the default groups.
I’ve printed this one in colour and “it’s going straight to the pool room!”
The other great reference is on the sharepoint solutions page. This is a collection of visio diagrams on all sorts of sharepoint topics. Search for the diagram on application security.

[...] Great sharepoint 2007 permissions matrix [...]
By: SharePoint 2007 Link Love: 02-26-2008 at Virtual Generations on 27 February, 2008
at 1:04 am
I here the newcomer. Not absolutely I will understand with topic. Explain, please. http://kopitop.ru/map.html
By: goolloog on 8 November, 2008
at 9:46 pm
You wouldn’t happen to know how I can check effective permissions for a user in sharepoint? Aside from having to look at every site and all content inside?
By: Kevin on 10 April, 2009
at 12:42 am
hi , cant seem to add alerts for all authenticated users …can any one help
By: susan on 22 November, 2009
at 2:22 am