.LRN has weblogs, so out of the box you can you use it, I agree that has a big potential for the learning process.
In the other hand, will be really good when the COP (community of practice / KMS) is ready, then such tools will become more powerful since you'll be able to rate the value of a given post for later searchs.
Thanks for this. The value ratings will be great for the searcher but will they inhibit the poster who is afraid of getting a bad rating in public? I do not have the answer, just a question to consider in the design. When will the COP funcitons be ready?
Well, COP is beyond just ratings, but I think will be not so hard to make the end user to decide whether he want to be rated or not, etc, since it could be a stopper as you said.