SharePoint

What is SharePoint?
Microsoft SharePoint is a family of software products developed by Microsoft for collaboration, file sharing and web publishing.  One purpose is that it can be used for, in small business, is as a company intranet or internal portal.  I like to think of it as a way to visualize the data that is inside of department/company folders.  One of the triggers I ask clients is whether they are finding they are spending a lot of time trying to find documents.
Here is a good introductory article on the CMIT Solutions blog that is worth reading too to understand SharePoint.
Since one of the key aspects here is visualization, you can understand more about SharePoint is and what is can do from the following videos.
1. Good Introductory Video explaining what SharePoint it is.

2. See a sample SharePoint site.  This video is geared toward end-users that explains the structure/concepts of a SharePoint site.

3. This video shows how projects can be supported by SharePoint in a company.  Features that are highlighted are: Document management, document search, team calendar, contact management

4. Overview of a sample SharePoint team site and some end-user  basics. Features covered are: announcements, calendar, document management, document templates.

5. Design example for easy filtering of multiple “items” that have a common attribute. This video shows a great design for displaying “things” that may be tagged with “attributes”.  In this example a particular company is selected and then only the tasks and documents related to that company are shown on the screen; the video then goes on to show a SharePoint Developer how to do that.