You don't need an app, just go to http://dish.sling.com on your phones browser and you will be taken to a site optimized for your phone.
You can even use your iPhone as a remote control from the site to control your DVR, yup you can pause, rewing, fast forward etc using your iPhone as a remote.
If you have a windows mobile phone and would like an optimized browser for dish.sling.com try: Iris Browser. It is based off of the same source code as the iPhone browser (Safari) so the website thinks it is an iPhone. I use it from time to time with no issues.
The sad part is the developer just got bought by RIM (blackberry) so they are dropping their Win Mo development
i use it from my Palm Pre and it's great to be able to manage your DVR from the phone and as Scott said you can use your phone as a remote control - freaks the kids out when they're holding the real remote yet i'm pausing what they're watching! :dev
Maybe it's just me, but I'd welcome an official app. The website is optimized nicely for the phone, but it is a little awkward to navigate. Plus, if they had a native app, many of the graphics wouldn't need to be downloaded and it would make the app zippier. It would be nice to swipe to scroll forward through listings rather then hitting a button and waiting for everything to reload.
i use it from my Palm Pre and it's great to be able to manage your DVR from the phone and as Scott said you can use your phone as a remote control - freaks the kids out when they're holding the real remote yet i'm pausing what they're watching! :dev