Moving highlight effect

[color=blue]Anyone know of a good tutorial for that effect you see a lot where[/color]
[color=blue]an object kinda ‘shimmers.’ [/color]

[color=blue]A band of white highlight moves across the object to give it a moving[/color]
[color=blue]refection of light.[/color]

[color=blue]Hopefully that is describing it well, sorry I do not have a link on hand, but[/color]
[color=blue]I’ve seen this effect in different places so if i run across it I will post a URL.[/color]