"My VexFlow" is a content publishing platform for musicians. It's based on my open source music notation project, Vexflow (http://vexflow.com).
You can use it to generate beautiful music notation, guitar tablature, fretboard diagrams, chord and rhythm charts, etc.
A list of new features: http://my.vexflow.com/articles/53?source=enabled
A sample article: http://my.vexflow.com/articles/82
Rendering fretboards: http://my.vexflow.com/articles/119?source=enabled
The open music notation language (VexTab): http://vexflow.com/vextab/tutorial.html
And finally, the VexFlow code: http://github.com/0xfe/vexflow
I hope you like it. Feedback appreciated. :-)