Prompt 3

I foresee myself working in two separate environments.

K-12 and Corporate Training.

In a K-12 environment, a collaborative blog might be a good idea to keep the parents updated about various activities that happen in the school, maybe send out a call for volunteers for events, or reports on events that took place in school, policy updates etc. The blog could be written by the principal and a designated faculty member who may put up pieces on behalf of the various departments.

A wiki does not have a particular use at the admin level in K-12 settings, in my opinion. However, it could be used to foster collaboration and slightly divergent thinking of part of the students if used as a tool in class or as a project requirement.

In a corporate environment, there are already documented instances of wikis being used for knowledge management. Gina's blog is a good example of the use of blogs to "educate" people on various issues pertinent to the organization and others like it.

A K-12 blog doesn't really support learning per se or performance but it does let the public know about the school's performance and as such allows for a sort of accountability and transparency in its functioning for its stakeholders - the parents. One could say that the parents learn about the various happenings in the school through it.
For students, use of a wiki in project work would foster the spirit of collaboration, held develop team work skills, thinking and filtering skills and if the teacher sets some sort of criterion about quality of work, it would also help them in reseach/writing skills.

In a corporate environment, wikis help provide "just in time" training. Where procedural knowledge is not required, one could replace training seminars with information on a wiki. People don't waste time and money in training but just pull up information on a need to know basis.
One could argue that procedural training could be achieved through use of videos and pictures, as has been discussed on the discussion board. However, this training would require setting aside specific time for the creation of the resources and also their distribution.
Blogs are a similar source of knowledge, which are not as easily edited by members of the organization. One would assume that SMEs might be in-charge of blogs where any member might be a contributor to a wiki.

As far as design/implementation challenges go, in my experience (and I mean no disrespect to anyone here - either in this class or otherwise), teachers who've taught for a long time tend to be extremely resistant to change and bitter in general. There are of course, exceptions to this rule. However, some new activity that might require extra work on their part, above and beyond their job description will likely cause some sort of resentment. How would this be handled by management?
Well, in India, it's pretty authoritarian. So people will be expected to do as they are told, and moaning will ensue. The job will get done though...
[This has been your fix of cynicism for the day)

Resistance in corporations might come from training departments, who might think their duties are being usurped by a wiki. A centralised pool of knowledge might make instructors obsolete. Then there are employees who prefer to be told what to do and might prefer a training scenario, as opposed to being self-regulated and learn on their own. Further... wiki scripts have their own particular syntax and it involves learning a new skill before you can contribute to the effort. Some people might find this irksome.
How might opposition/resistance be solved in such a situation? Especially in a multi-national corporate environment?

That's a very good question.
However, the prompt doesn't ask for solutions. So I will leave it hanging. ;)