XRAY is a tool ( a bookmarklet actually) which behaves like the web developer toolbar by Chris Pederick. But the tool is basic and the web developer toolbar have more features than this, but hey it’s free, so I wont complain. Besides sometimes it’s not about the tools but how you use that tool. Case in point, you may have the latest Dreamweaver or Photoshop but who among us can honestly say we know each and every feature of this piece of (wonderful) software?
That’s why its good to interact with other developers/designers, because you can always learn from anyone, regardless if they are a newbie or an expert. People have different approach, in anything they do, that what makes us unique, that what makes our experience different from everybody else. And that makes learning variable.