I'm not sure if this is already out there or not, if it is I can't find it.
My thought on this is developing an app that allows you to create topics, check your tracked threads, and PM users without the hassle of loading a browser from your phone everytime.
It seems like it be pretty easy to setup and a lot of users would use this App.

What do you guys think about this?

It has been suggested many times, and has been denied every time. I don't think it will happen.

The site was recently improved for phones though.

To avoid closure of your site suggestion topics remember to read this prior to posting: How To Post A Site Suggestion

Ahh my bad. Thanks for the heads up m8