Web 2.0 / Enterprise 2.0 

"Web 2.0" is commonly associated with web development and web design that facilitates interactive information sharing, interoperability, user-centered design and collaboration on the World Wide Web.

Examples of Web 2.0 include web-based communities, hosted services, web applications, social-networking sites, video-sharing sites, wikis, blogs, mashups and folksonomies.

A Web 2.0 site allows its users to interact with other users or to change website content, in contrast to non-interactive websites where users are limited to the passive viewing of information that is provided to them. 

McDaav Systems has vast experience in designing web2.0 enabled websites using CMSs like Drupal, Joomla, Alfresco etc.