I like how the OpenMoko people think.
Give the phone some info about your body (gender, size, weigth) and when/what you drink and it will compute an approximation of the amount of alcohol in your blood. Updates automatically, could have an alarm, when you are probably sober again. See, for example (German text) http://www.misterio-online.de/promille.htm
OpenMoko is an Open Source project for cellular phone software. It seems quite active and they have a current version of the software running on an actual phone. So it’s not just vapourware, AFAICT.
The whole wishlist is certainly worth a read. Full of neat ideas, some of which are trivial to implement, others are much more ambitious. For those who care about creativity, innovation, and technological sophistication, this is exactly the kind of project which shows the power of dreaming.
Or maybe I’m just recognising other “benevolent inventors.”
Whatever this feeling is, OpenMoko might drive my dream phone in the not-so-distant future!