Just a link over to the module section for a post about Simplify, a module that allows you to customise the Silverstripe admin interface without any coding, simply by setting security permissions.

Features:

- Simplify the Silverstripe admin, provides an easy way of turning features on and off
- Make your CMS Admin easier to use for non-technical end-users
- Permission based, so you can enable options for some users but not others.
- Over 24 new permissions to fully configure how the admin looks
- Easily add in your own custom Simplify permissions
- Supports i18n of permission descriptions

http://silverstripe.org/all-other-modules/show/264972