I chanced upon a very interesting blog dedicated to Adobe Illustrator, called bittbox.com. The glossy buttons shown above are from the blog. There are other amazing goodies to be found there too, like time saving tips, free brushes and more glossy buttons.
If you're really into Illustrator, the nitty gritty stuff, you'll have to visit Mordy Golding's Real World Illustrator blog. If Illustrator's a person, he's the person. He can be found lurking in Adobe forums too, as I've found out.