Web 2.0 - Identify Important Characteristics & Share Examples?

Help clarify and expand our table of factors and examples of Web 2.0!
What are your favorite educational applications of Web 2.0? What are their educational implications? Please answer briefly as a comment to this posting. For a more general intro to our work on Web 2.0, see http://www.tltgroup.org/oli/fridaylive/120806.htm Also, see our Table of "Factors and Examples" which provides brief explanations of key factors and hot links to related examples. Complete table available within a Google Document at: http://docs.google.com/Doc?id=ajbkwcmd3bt8_20crwj6p

HERE'S A LIST OF IMPORTANT WEB 2.0 FACTORS FROM THE LEFT-MOST COLUMN OF THAT TABLE.

ACCELERATION
Variety of tools, resources available - growing accelerating, impermanent!; TMI/TMO [Too Much Info; Too Many Options]

ACCESSIBILITY
Accessibility/Mobility/Ubiquity - access from many different locations, devices

FLUIDITY
Dynamic Content -Easy, frequent, changing of Web sites, info,

CHANGING MODALITIES
Multimedia - Combining sound, video, ...

SHARING
Sharing info, resources, categories; Social/Group Collaborative Creation/Editing/Responding;

PUBLIC/PRIVATE?
Public/Private Blurring - [voyeurism?]

DIFFUSION OF AUTHORITY
Non-hierarchical authority: authenticating, cataloging, editing, publishing, modifying (software)

DIFFUSION OF CATEGORIES
Folksonomy? vs. Authority controlled cataloging; Attaching and sharing labels to objects (Meta-tagging)

DIFFUSION OF PUBLISHING
RSS and other "Feeds" enable new roles that blur the boundaries between "author," "publisher," and "reader."

CHANGING ECONOMICS
Fluid Business Models; Changing role of advertisement?

CHANGING DIMENSIONS
Virtual Reality/Avatars; SecondLife...

NEW CHANGE?
New kinds of change? New ways of changing?

BEYOND?
What else? What have we missed?

Thanks for your help in expanding and clarifying this list - and completing the related table.