User interface
The aspects of a computer system or program which can be seen ( or heard or otherwise perceived ) by the human user, and the commands and mechanisms the user uses to control its operation and input data.
A graphical user interface emphasizes the use of pictures for output and a pointing device such as a mouse for input and control whereas a command line interface requires the user to type textual commands and input at a keyboard and produces a single stream of text as output.
Here are some examples of remote controls:

The interface exists of a clutter of button functions, colors, and forms. This inconsistent use of interface is confusing and doesn't improve the use of the product.
Here are a few examples of new user interface components for the remote control 
Voice recognition
Control multiple devices and surf your favorite channels with your voice! Stores Up to 80 speech samples, Controls 4 Devices -TV, Cable/Satellite, VCR/DVD & Audio. Record your own verbal labels that is connected to a remote control function.

LCD/menu display
A spinning wheel with LC display in the famous iPod music player. This kind of richer, menu-oriented interaction is more suited to young people. Older people prefer a 'one-button, one-function' type of interaction.

Integrated scroll and push button
A scroll button with integrated push button (such as in modern computer mouse) at the side of the remote:

TV remote control for special user
Children
Program in only the channels you want your kids to watch - all others are automatically blocked! Child Friendly design and ease-of-operation ensures kids will love using their own remote! Program in up to 10, 4-Digit channels. Dedicated buttons make getting to channels easy. Supports TV's, TV/VCR, Analog and Digital Cable, DirecTV, Dish, TiVo, ReplayTV and Ultimate TV. Secured and hidden programming and battery covers protect your settings. New version offers even more features and options.

Elderly
Big Button, Oversized TV Remote is the largest universal remote control available!

This jumbo universal remote control is almost impossible to misplace or lose.
Our oversized programmable remote control has big 3/4" buttons that light when pressed. The numbers are on round buttons, the TV channels scroll on triangles on the left and the volume adjustments on triangles on the right. This arrangement is a lot less confusing for most people.
Turn down the TV
You are sitting in front of the TV, and want to turn down the sound. You grab the remote control, scan for the button with the down-arrow and push it. The TV gets louder! You pushed the up-arrow button instead of the down-arrow button. Why? 
The letter "V" for volume is on the two volume control buttons. Although the buttons are shaped like up- and down-arrows for increasing and decreasing the volume, the letter "V" looks like a down-arrow. When you are scanning the remote control for a down-arrow, you see the "V" as a down-arrow, and press it. Unfortunately, the first "V" you see is on the up-arrow!