Building Your Own Knowledge Base?

Flobster asks: "I just joined a company that has left the state of start-up and now wants to deliver professional end user support by the web as well as means to share product information internally. I know programming and databases and I have this fantastic MS Knowledge Base in the back of my mind - but just how did they organise that? All we have until now is plenty of word and visio based docs and release notes along with different FAQs, but the info the help desk is giving to customers is more or less never tracked or gathered somewhere. So where could i get a system or help to build a system that organises these texts, diagramms and future information so that i could search for them on a website? Anything from complete source code to books i should read would help!"