Wiki
The differences between the wiki and the Blackboard discussion that jumped out for me were the anonymity of the contributions to the Wiki. I am accustomed to having all of our contributions identified.
The other wiki I have used was WYSIWYG, so I was a little surprised to see the html tags. Fortunately ? I have spent a fair amount of time with Nvu and Dreamweaver tutorials that I am beginning to recognize the simple tags.