There were some articles published about the NatTable. You can find them linked here.

• NatTable 2.2 - Verwendung und Anpassung des NatTable Widgets in wenigen Schritten (german)
• NatTable Advanced - Komfortfunktionen leicht gemacht, Excel kann das doch auch! (german)
• Nebula NatTable 1.0.0 (german)

If the direct links doesn't work you can find the articles and the source code of the associated examples here.

There were some talks about the NatTable at several conferences. You find the links to the videos and slides here.

• EclipseCon Europe 2012 - Introduction on Nebula NatTable - Video
• EclipseCon Europe 2012 - Introduction on Nebula NatTable - Slides
• W-JAX 2012 - Introduction on Nebula NatTable - Video
• W-JAX 2012 - Introduction on Nebula NatTable - Slides
• JAX 2013 - Next Generation NatTable - Slides (german)