Excel as a UI Mockup tool

I just finished using Excel as a UI Mockup tool and am amazed at just how usable it was.

More (with pictures, tips and techniques) when my left index finger is out of the bandage.

"Whose Turn?" App

This idea is from a recent outing of 3 couples with kids under six:

A Phone app that tells whose turn it is to change diaper/ deal with the lil monsters / feed them / whatever.

You choose the activity, it keeps score and tells you whose turn it is.
Once you're done you say you did it, and it updates the score.

Bonus points for doing things out of turn is a configurable setting :)