I recently found DVR Remote, an App for the iPhone that allows you to control your Tivo over WiFi.  I have a Logitech Harmony 880 universal remote which I love, but when I found this app, I became intrigued.

As a remote control for my Tivo, this is pretty lame:

1. The buttons are small and it's easy to hit the wrong button.
2. The auto-sleep on the iPhone makes it annoying when you when you want to say... Pause now.

It works, but it doesn't replace your Tivo or universal remote.  However as a guide and keyboard, this app is great!  These are a few of my favorite features:

1. Type using your iPhone!
   This is the best reason to get this app.  I hate typing things on the Tivo using the left, right, up, down buttons.  But with this DVR Remote App, you can type what you want, hit enter and the app will send the correct sequence of buttons to type out anything.  This saves you so much time and frustration. 
   
2. Browse your Now Playing List
   You can can also browse what has been recorded and read the summaries on the iPhone from anywhere in your home.  If you are watching a show, you can browse the Now Playing without interrupting your show.  The only thing missing is the ability to actually select a show from Now Playing to watch. 
   
3. Favorite Channels
   You can also setup favorite channels, which is very convenient

As TV's and DVR's become more connected, the remote is going to need to evolve.  Text input and content browsing need to be overhauled.  This will be an interesting space to watch as the smartphone market continues to grow and smartphones become the interface for other devices.