Let's learn how to make an icon like this:

First, open your icon base. Here's mine:

Place your text where ever you want it, using
any kind of font, straight, crooked, upside down, however you
want the text to be. (My Adding
Text Tutorial)

Make a new layer above your text layer, and fill
it with a gradient.

Now we're coming to a tricky part, and I can't
really show you. Hold down the alt key while putting your cursor
on your layers palette, on the line between the text layer and
gradient layer. Move the cursor slowly, when you get it just
right, you will see two entwined circles. I have no clue what
this is called or why it works, I just know it does. 8^) When
you see the two circles, click with your mouse. If you do it
just right, you will now see the gradient only where your text
is.

Now, click the very bottom button on your tool
palette to jump to image ready (Or, go to File > Jump To
> Image Ready. If you are totally unfamiliar with Image Ready,
you might want to look at my tutorial
about the program.) Your icon will be open when you get
there. If your animation and layers palettes are not open, you
can open them by going to Window > and putting a check next
to Layers and Animation. In the animation palette, you will
see your icon open in the first frame. Add another frame by
clicking on the icon that looks like a dog eared piece of paper.
Now, click on the first frame on the animation palette, and
click on the gradient layer to select it. Use your move tool
and keyboard arrows to move the gradient all the way to the
left, until it no longer shows on the screen.
Then click on the second frame and gradient layer,
use the move tool and keyboard arrows to move the gradient all
the way to the right until it is off the screen.
Now click on frame one again, then click on the
icon that looks like diagonal fading squares. You will get a
"tweening" pop up box that looks like the one below.
Change your settings to match these:

You will need to play around with how many frames
in order to get the effect you like. It can't be too many, or
the icon will have too large a filesize to use at LJ. Too few
frames, and your icon will just be a fast, jerky motion rather
than smooth and scrolling.
Click ok.
You will see many frames in between your original
two frames now. 5 to be exact! You will need to click on each
frame, and turn on each layer that you want on in that frame
by using the layers palette.

(Click for larger image)
Next step is to set the timing of the frames.
If you do not know how to do that, please visit my tutorial
on learning
to animate. I set mine at .15 seconds, then saved as a .gif,
which is also covered in the animation tutorial.
Done:

If you have questions or comments about any of
my tutorials, if you would like some one on one Photoshop or
graphic building help, or if you have a suggestion for future
tutorials or other resources, please email
me. I would love to hear from you there! Or please consider
dropping some coins into the Tip Jar
to help pay for this site's bandwidth usage.