CIO Insight has posted the results of a survey of CIOs about which web apps they use "personally":
Video over the web 54% Wikis 49 Blogs 48 RSS (Really Simple Syndication) 47 Podcasts 39 Social networking (e.g., tagging, social bookmarks, community sites such as del.icio.us, LinkedIn, Technorati) 33
Isn't that interesting? Statistically speaking, wikis, blogs and RSS work out to be about the same.