My banners speaks about a Web 2.0 era, but what's Web 2.0 anyway? I loved reading Kathy Serra's post about Web 2.0 and I agree with her the best thing about Web 2.0 it is there's no a definitive definition, but it's kind of a thought movement. In my experience, Web 2.0 is a feeling. It's the perfect mix between Ajax, great UI design and great app concepts. I won't classify an app as Web 2.0 just because it features uber-geek rollover point-and-click effects. If such effects or the  application overall feeling make you feel a s**t, forget about the Web 2.0 validation logo. For programmers, that feeling can descend by an accurate technical analysis of features and techniques. For users, that feeling should be determined by their grade of satisfaction and/or no-frustraction after a 5 mins session with the app. I know it doesn't sound precise but that's what I think about the Web 2.0 fuss.