You can check out the slides from Casey Bisson's webinar on the Introduction and Overview of Libary Open Source Software at the links below. Remember you can register for and view the full recorded session at any time by going to the Webinar Series Registration Page
Here's the PowerPoint version of his slides.
Here's the PDF version of his slides.
Be sure to catch all the Webinars. Next up is the Michigan Evergreen project, a shared consortial open source OPAC/ILS.