Craig Anderton's article on Sonar tips is really good this month if you haven't read it (SOS, November)

Indeed, great tip, thanks mate !! 

That's very helpful feedback. I usually concentrate on a single feature and explore it in depth, but this time around thought it would be interesting to try an assortment of tips involving different features. I'll probably do more of this in the future if this approach continues to get a good response.