Opera launches Dragon Fly which is in the alpha version. This will help Web developers. This contains

1. JavaScript debugger

2. DOM inspector

3. CSS inspector

4. Command Line to allow commands to be inputed

5. Error Console that outputs validation errors and warnings exhibited by the CSS and JavaScript connected with the page

6. Proxy to allow debugging directly on mobile devices

The main thing i like is the break point in the javascript. I think it is worth giving a try.

remember this is a test version and may contain bugs.

Go and have check in the following

Opera Dragonfly Alpha

Introducing Opera Dragonfly

Introduction to Opera Dragonfly

Opera Dragonfly Architecture