Web 2.0 refers to the propensity of recent Internet applications to be more collaborative and provide for a richer user experience.  Web 1.0 was a Web site that looked like a brochure or a resume.  Web 2.0 is a blog. Web 1.0 was your newspaper's classified ads, just 'webified'.  Web 2.0 is eBay or craigslist.  Web 1.0 was Netscape (i.e. here's some software). Web 2.0 is Google (there's nothing to install but it's powerful). Web 2.0 is about harnessing collective intelligence and eliminating the software release cycle - it's about providing services, not products.  Much of the agile software development mindset is rolled up into the phrase.  It's about trusting users as co-developers of content or even of technology. Web 2.0 includes a social dimension, greater openness and transparency in process. It includes the use of new technologies. It has a more open style and a "keep it simple" approach. Many of these attributes go hand in hand. For example, open-source technologies tend to be simple, transparent and lightweight.  It's more of an attitude than a specific architectural protocol. How does Web 2.0 affect you as a project manager? Do you use a computer? Does your company have a web site? Do you market yourself to potential customers on the Internet? Do you do any business at all over the Internet? Yes? The question is how does it NOT affect you.