Few days back, Gartner released its Magic Quadrant for Horizontal Portals. Here is a quick description of scope of this MQ.
Gartner defines a portal as "a Web software infrastructure that provides interaction with relevant information assets (for example, information/content, applications and business processes), knowledge assets and human assets by select targeted audiences, delivered in a highly personalized manner." Enterprise portals may face different audiences, including:
- Business-to-employee (B2E)
- Business-to-consumer (B2C)
- Business partners (B2B)
Of course, the public-sector corollaries to these three high-level audience types are also considered applicable. A portal product is a packaged software application that is used to create and maintain enterprise portals. These products can be used to design vertical or horizontal portals:

Oracle being one of the leaders is providing the reprint of this MQ as free download. Grab it from here.
http://www.oracle.com/us/corporate/press/1870043