There was a great thread some time ago on HN about PKB (personal knowledge base). You might find there a lot of info. It prompted me to look for new solutions,

There was a great thread some time ago on HN about PKB (personal knowledge base). You might find there a lot of info. It prompted me to look for new solutions, I made a good progress but I'm still not happy. The best thing I use and can recommend is TiddlyWiki. I keep it in Dropbox so I can access it on mobile.