I've used Unified Remote many times. This app turns my Android tablets into wireless keyboards to control my HTPC. However, Unified Remote is not available for iOS.
I was unaware of an iOS alternative...until today. Better late than never.
Now I'm using Hipporemote on my iPad as a wireless keyboard to control my HTPCs. It seems to work great so far.
Man, just when I thought I couldn't love Apple anymore than I already do...