This a very easy and accessible way to make modifications to your head section. One feature is that when you change your template the modifications stay intact. If you mess up you can simply deactivate the plugin completely. All the features below are individually selectable.
Stylesheet links can be inserted.
Other uncategorized material be appended.
There is also an option to set IE7 emulation for IE8 browsers.
The Standard Mootools may be deactivated. JQuery/JQuery UI can be accessed as can SWF-Object.
There are over 400 fonts available online from Google, thus removing the need to play safe with typography.