What is the Griffin PowerMate USB Multimedia Controller ?
Griffin
PowerMate USB Multimedia Controller is the coolest volume knob your car
computer has ever seen - but it's so much more.
You can use it to edit home movies or scroll through long playlists or
create your next audio masterpiece. How can PowerMate be this cool?
Because it's an assignable controller that you can program to do
anything you want, in any application. Customize it to your needs and
go wild!
PowerMate functions beautifully as a convenient volume knob and mute
button for music listening on your PC or Mac. But that's just the
beginning of PowerMate’s possibilities.

Pump Up The Volume
PowerMate is the coolest
volume knob your desk has ever seen. Crank up your MP3s and CDs. Then
with a push of its button, mute your music to answer the phone and
handle the complaints.
Scroll Through Playlists With A Twist
Find the perfect song you are looking for with your very own Jog/Shuttle wheel. Use PowerMate to
scroll through and select the song with the push of a button.
Touch And Glow
Cool blue light glows underneath
the PowerMate, showing you visual status of what you're controlling.
Turn the volume up – the glow gets brighter. Push mute – the light
turns off. Coolest of all, it pulses hypnotically while your computer
sleeps.
Take It For A Scroll
PowerMate is the fastest
way to scroll through long text documents, web pages and spreadsheets.
With a flick of the wrist, you get to the "bottom" of the story in
record 
time.
Spin Control
PowerMate is an assignable
controller. That means you can program it to do anything* you want – in
any application. Program the wheel to scroll your email, set the button
to switch to your browser. Customize it to your needs and get wild.
Pump Up The Volume
The Griffin PowerMate is the coolest volume knob your Car Computer has ever seen. Crank up your MP3s and CDs. Then with a push of its button, mute your music to answer the phone. Color: Gray
Mp3Car Forum Review
The scroll wheel is an excellent invention and I can’t think of
using a computer without one. Still it’s just you and that mouse. Maybe
you keep your other hand at the keyboard.
The Griffin Powermate has a name, a look and a description that suggest that you should use it to adjust the volume on your computer.
I love this incredibly well built, good looking, solid and very
useful knob. I have never used it to adjust the volume on my computer.
I use it to scroll in my browser. To zoom in Photoshop. To shuttle
in my video editing software. To scroll in my photo archive. Right hand
on the mouse. Left hand switching between the keyboard and the
Powermate.
It has completely removed quite a bit of strain on my right hand.
There is a very reliable rule that says that a company that makes
hardware can never make good software (look at the software that
follows ATI’s graphics cards or Creative’s MP3 players etc…*) Griffin
has done an exception with the Powermate. The latest version of the
software for this device is actually quite useful. And if you don’t
like it you always have Girder and the Girder Powermate Plugin.
I haven’t tested the Girder Plugin yet. The original Griffin software does what I want at this point.