I would love to have the "leafsnap" app. It's current on Iphone and coming to Android.

Home | Leafsnap: An Electronic Field Guide

from leafsnap:
Thanks for your interest in Leafsnap!

We are working on a volunteer basis and thus have limited resources available (time, money, manpower, etc), so we have to prioritize our efforts. Our primary goals are to expand coverage and release an Android app first. After that, we will consider additional platforms if there is sufficient demand.

Leafsnap Team

Send them an email (press@leafsnap.com) if you can volunteer your time and talent