This is the most sought after application need we currently have. We know how to make a slick app and all the advanced stuff like push notifications, storing local device data, scanning barcodes, talking to web apps, and social media integration (youtube, twitter, and facebook).
The tablet presents a different opportunity that smartphone devices just don't have. With more screen space, we can do some pretty cool stuff. This plays nicely where a phone is too small but a computer is too big.
We've been building rich web apps for a while now. Most of our mobile apps really need a web site to complete the solution. We usually build end-user and admin versions of the web app and enable mobile apps to talk to it through web services.
The largest growing need that we've seen, its challenging to build apps that run on several different hardware vendors, carrier networks, and Android OS versions. We've been there and done it and we can re-use code if you're targeting iPhone too.