Web 2.0 tools for teaching and learning/What tools are available?

Each year, Barry Dahl, CIO at Lake Superior College in Duluth, MN, releases his favorite Web 2.0 learning resources.

2008 Top 10 Tools for Learning

Activity
Please browse Barry Dahl's 2008 Top 10 Tools for Learning, then post the number of tools in Barry's list that you are presently familiar with.

Number of Tools

 * 8 ~Drew
 * I've heard of most of them, but have only really used Flickr. ~Thia
 * I have used Flickr and Twitter. ~Ashley