Whether you’re looking for information, inspiration, or a place to share a recently given presentation, SlideShare (www.slideshare.net) is this thing for you. Slideshare is a website where users upload their own PowerPoint presentations, allowing others to view and share them, as well as commenting and interacting with other viewers (think YouTube for PowerPoint presentations).
SlideShare is a great way to share information. Try searching for some Library-related presentations and see what you can learn.
(Why not start with this one on Blogging and Twitter? http://www.slideshare.net/nathantwright/library-20-jump-start-your-library-with-blogging-and-twitter)