a couple of comments on your "Hands on with Ubuntu 14.04: The best Ubuntu desktop ever" article (which I have to say I enjoyed; these are minor quibbles).
First, "if you use an older PC you could get as much as 13 years of use out of it before you'd need to buy a new PC—just try that with Windows." Windows XP was released in 2001 and went out of support less than two weeks ago. That is, in fact, thirteen years. Microsoft may do things wrong, and I am in general no fan of their business, but castigating them over one of the things they actually do well is not really cricket.
Finally, you suggest to people that they can disable scopes they don't like, which is a good idea, but then give them a command line to do it. Why not explain how to disable a scope from within the Dash itself? Not only does providing command-line fixes for this sort of thing perpetuate the myth that using Ubuntu requires mad terminal skills, but more importantly it's not generalisable: how do I disable a recipe scope using your technique? Even I don't know the internal scope names for everything (I know how to find them out, but you don't explain that). If the advice showed how to disable scopes in the Dash, then it would not only be useful for people to turn off other things they don't want, but it would also help encourage people to customise their Dash the way they want, rather than just to see this as a way of turning off a few specific things. Teach a man to fish, right?