Brad, I found your site as I looked for unique ideas. Yes congrats, I am calling you unique and your ideas good.
The reason I am looking for unique ideas is because I am building a system to organize and manage all my information.
My calendar has some of your ideas. My calendar also displays things from other parts of the system by date. However, I wanted to say something about the way most systems store contacts.

I have address the following problems and others for contacts:

Why can't I have the same phone number linked to two contacts? (Mom & Dad)
Why can't I have the same address linked to two contacts?
Why am I limited to the number of phone numbers or address that I can put on one contact?
Why can't I leave an old phone or address and simply mark it so it is striked out?
Some systems don't allow you to link two contacts together.

My system does allow you to do this and more.
My system also has 5 ways to notify me of events. Text to Speach(audio), wav file(audio), email (home or cell phone address), has it's own web interface, YAC interface to pop up message on computer screens. IM integration is an idea that may be implemented in the future.

My point is that most systems designers are not thinking outside of the box. (have you seen gmails contacts? Good thing they are working on a better version, which I can't wait to see.) They design to mimic the systems of the past. Where is the progress in that?

freak3dot