Thoughts on .. PERSONAL KNOWLEDGE MANAGEMENT
Let's see.. blogs.. wikis..CMS's..instant messaging..email..spamfilters..search engines..etc etc etc..
As it turns out there is so many things one would need to really manage one's own knowledge effectively.. (now i know why i have so many servers running at home)..
But then again.. there is no one service that provides this all to you.. and if.. well, it would not be free..
Look at Plone (plone.org). It is a CMS running on top of Zope that is growing into a KM system. It is free, powerful, easy to use and it continuously expanded to include more and more functionality (search engine, templates, taxonomy, etc. etc.). Way ahead of a lot of professional ($$$) CMS solutions.
Once again, this is only my $.02..