What app(lication) is still missing in the (Android) Market/App Store?

There are a million+ apps already in both stores, but which one, according to you, is still missing?
What handy application would you like to have (and use) on your smartphone?
And while we’re at it (and it’s been a while since it was last asked) what is your most liked app that you installed recently?

I would like to see an app that identifies leaves and/or flowers, after you photographed them.
Favorite app: Audiogalaxy, which streams your music from your computer to your Android phone.