Scribd still seems to be working well. distribution of documents with comments and networking etc. I have just joined two MBA groups where people have linked to my docs.

however I can't find much on Critical Management. Zaidlearn writes about how to teach critical thinking, or thinking creatively, and one remark is that some other way of describing it could be useful. "critical" can be a block.

Still, maybe more critical papers will turn up on Scribd and establish more of a base.