We are asked to describe the difference between a blog and a wiki and think about applications for these two Web 2.0 technologies. I think of the blog as having one source. It is the thoughts recorded from one individual which are then put out on the web for others to comment on. A wiki has a group source. It is intended for several individuals to collaborate and exchange information, and the wiki is the lastest state of this group interacation. I think blogs are great ways for one person to get information out, i.e. a liason librarian letting readers know about new programs or ways to use the libraries services. A wiki would work well in a case where researchers in different locations are working on a paper or a grant together. Each contributor can access the grant and make changes. One draw back to the blog is that your intended readers or target need to receiving the blog feed and reading the blog. A draw back to the wiki would be if changes remove data that one collaborator wanted maintained. I am a novice to these ideas, so perhaps the problems I foresee are not problems at all.