One of the biggest improvements in this area come when you have a standard format such as Docbook and then give your search engine the intelligence to understand it. Telling someone how to move a filesystem from one partitition to another takes less than a page, and forcing them to use a relatively complicated markup such as Docbook is a good way to get the author to decide it's not worth the effort. There are ways to get around this sort of thing, people who manually convert them for the original author and things like that. As it stands now, the LKBP is more of a generalized search engine- that is to say, we don't care what the format of the document is, as long as it can be represnted on a web page. Basically, we need to think this out really really well.
Licenses are a kicker.
The LKBP has a license based on the Netscape Open Directory Licnese. I think a license such as this is more applicable to such a project, since it's the categorization of the content that makes it valuable. There is tens of thousands of docs for linux around the web, the reason they're not of much use is that people can't find them. Generally allowing a number of pre-approved licenses for the actual content should be good enough. Keeping a Linux slant on things IMHO is a good thing.