There is no official app, however if your android launcher allows you can create home screen icons to do this use the "Website Shortcut" app to create an app shortcut, that'll brings you direct to this site, if it doesn't show your icon on the home screen you may need a different launcher app, I use iM launcher, it doesn't appear to be available on the app store, but you can get it by doing a google search :)

I would really love to see a true "app"... I would use the site a lot more that way!!

Yeah I'm the same it's frustrating not having it in an app. I don't always look at my emails and even if i did add it to my home page I'm guessing it doesn't show notifications?

There is an app on Android now, so go get it on the play store :)