The site preferences module is great for quickly tweaking small things that make a difference on your website. Being able to add a page title suffix is on way to make your website stand out. Having one place for access to your Google Analytics Code and email addresses for forms makes it easy to navigate.
My favourite thing about this module:
I really like that this module houses some important features that many users may not even think about. For example, being able to easily update your Newsletter email, etc. is a great tool.