Bill Ives has posted a great series of posts on real-world experiences with Microsoft SharePoint. He characterizes SharePoint as the "most common platform for enterprise 2.0."
The posts cover a set of four sessions at a conference on “Real World Sharepoint Experiences”sponsored by Knowledge Management Associates.
The four sessions covered:
Doug Cornelius also liveblogged the same conference at his post "Dispatches from the Front Lines - Themes and Trends in SharePoint Use."
Both posts give you access to great information about the ways people are using ShaprePoint in the real world filtered for you through the eyes and ears of two very knowledgeable experts.