Smart CSS Auto Loader
Free Plugin for WordPress and ClassicPress
This free Plugin for WordPress and ClassicPress allows you to load additional CSS files without the need to change theme files
This handy little plugin allows you to load additional CSS files without the need to change the theme code. To load additional stylesheets just put them into a directory named cssautoload
.

There are three different locations where you can place the additional files – Theme independent, Theme dependent and Child Theme dependent. Also the plugin allows you to load CSS files per media type. To use a different media type just create a subdirectory with the name of the target media type.