Opera 9.5 is definitely fun to play with.  There are a lot of cool new features, the rendering is fantastic, and the amount of widgets is also a plus.  I thought we could take a look at the three guitar widgets I found.

GuitarChord Widget allows you to easily locate chords and individual notes.

Guitar Scales Drawer is a great widget for finding a wide range of guitar scales. 

Finally you might be interested in the Ultimate - Guitar widget.  This allows you to quickly find various guitar tabs from their site.