Another good intro to Web 2.0 issues is Nick Potamitis's short video on Vimeo, a more upmarket version of Youtube.
Cultural trends that have been accelerated by Web 2.0 might include:
- trans-global creative collaboration
- hybrid multi-media integrating text/audio/video/animation
- niche audiences spread globally
- an increasingly visual culture, privileging image/icon/brand/logo (some VI issues here)