There are some points to respect to obtain a web 2.0 style:

1. Simplicity
2. Central layout
3. Fewer columns
4. Separate top section
5. Solid areas of screen real-estate
6. Simple nav
7. Bold logos
8. Bigger text
9. Bold text introductions
10. Strong colours
11. Rich surfaces
12. Gradients
13. Reflections
14. Cute icons
15. Star flashes