Tutorials - Creating Glassy Buttons using Adobe Illustrator:
http://www.ndesign-studio.com/resour...glassy-button/
http://www.bittbox.com/illustrator/i...-glass-button/
http://www.ndesign-studio.com/resour...ls/itune-icon/
http://www.learnit2.com/tutorial%20020/index.html