HOW TO: Create “Web 2.0″ design effects using Photoshop
Web 2.0 is a term coined by O’Reilly describing the new trends in design and development 
appearing across a flood of innovative websites. This tutorial will show you how to create some of the more popular "Web 2.0" design effects using Photoshop.
Gradients
The reflective or glass effect was first popularized by Apple. There have been many tutorials about creating Apple’s "Aqua Buttons" and this is a similar effect. Web 2.0 Design Kit | Photoshop Lab