I have tried the same thing in layer styles, but haven't come close as to what can be accomplished by using photoshops other features. I have some contours that I created that make a gloss look, but again, may not be quite as good as what you are looking for. If you are interested in them, drop me a line and I will send them to you to experiment with.
Until then, here are a couple of tutorials on how to create that effect. (Some of these actually have a more realistic gloss look than your example.)
http://biorust.com/index.php?page=tu...etail&tutid=11
http://www.alanhettinger.com/tutoria...r/specular.pdf
http://graphicstudiofx.ashst.com/tutorials/candy.html
http://www.v4images.com/tutorials/tu...s.php?id=tut-3
http://www.idigitalemotion.com/tutorials/alien.html
http://www.infinite-fire.net/index.php?tutid=28
http://www.photoshopcafe.com/tutoria...%20buttons.htm
I tried to pick a wide variety. Hope these help.
LexiBlue