let's take a look at how RSS works within the realm of an intranet or employee portal.
Most obvious, departments publish content using RSS. This enables employees to subscribe to content they are interested in, increasing the likelihood that content will be read when it's new or has changed (employee's don't have time, nor tendency to regularly check multiple intranet site any more so than people check external websites to see if there's anything new that interests them).
Conversely, organizations that deploy RSS readers for internal content enable employees to create their own personal news or content update site to keep track of changing information that's relevant or interesting to them. This is the true definition of a "My Site."
Some basic areas where RSS is perfect include employee communications and internal news, HR communications and benefits updates (helpful for annual enrollment information, year end and new year changes), facilities information (very timely in the NY area with the current transit strike affecting business operating hours), management communications, and sales force related content (product updates, customer data, etc.).
The simplified RSS-trail has been blogs (2003), media (2004), enterprise (2005) (including portals), and now e-commerce...