Module Review: Themekey

project page - http://drupal.org/project/themekey

what does it do? - allows you to define theme-switching rules which allow automatic selection of a theme depending on current path, taxonomy terms, language, node-type, etc.

features
- individually-styled channels
- a front-page / "splash" screen
- a date/time-selected Christmas theme
- mobile themes for different auto-detected mobile devices
- special themes for "limited" or "old" browsers
- content, user, or role -specific themes
- indicating your environment (production, staging, testing, sandbox, … )
- testing your redesign safely on a live server

check out this website for tutorials on the ThemeKey module
- http://kalki.de/en/howto/themekey-tutorials.html