Some Web 2.0 stats from the Pew Internet & American Life Project survey covered in the article:
Percentage of Internet users who have done this Web 2.0 activity:
34%: Used the Internet to get photos developed or display photos.
30%: Rated a product, service or person using an online rating system.
27%: Shared files from their own computer with others online.
26%: Shared something online that they created themselves, such as artwork, photos or videos.
18%: Taken material found online — like songs, text or images — and remixed it into their own artistic creation.
14%: Created or worked on their own Web page.
13%: Created or worked on Web pages or blogs for others, including friends, groups they belong to, or for work.
11%: Used online social or professional networking sites like Friendster or LinkedIn.
8%: Created or worked on online journal or blog.
These numbers are really remarkable, because just 2 years ago, they were probably about half this size. I would hazard a guess that in the next year, we'll see an explosion in the above, with more consideration being given to these entities in the BtoB space.