Using blog for internal training

Just thinking loudly here.

There must be a way to use blogging for training purposes as well. We are a small 10 member team and run into constant need to learn (and sometimes unlearn) technical and business topics. It would be great if leading blogging tools can develop a way to manage a blog post as a piece of training post where comment section can be made extensible to include question/answer section. I am sure there is a way to build a workable structured environment by combining blog and wiki which can act as a training environment. Though it sounds pretty trivial.

Has anybody done something like this? Why re-invent !