I can write all of my software, documentation in latex or docbook or plain text, read email or news and keep a wiki and a day planner all together and cross linked.

Adding rememberance agent into the mix means that I get reminded about ideas I've written in other places. All of these things work on any unix. I haven't tried rememberance agent on windows yet.

All of this goodness and more can be found at www.emacswiki.org.