If You Have an IRTrans, Buy This – iRedTouch Review

Yes, you do need an IRTrans for it to do anything. If you have one, this app can make your iPhone/iTouch the control panel for anything with an IR remote. It's a very easy program to use. An hour after installing it, I was controlling all of my home theater equipment and my Mac. Pay no mind to the reviews that say there are tons of apps that do this. There aren't, and this one does a great job.
Review by powerfulmojo on iRedTouch.