Doing Ada right?

[EGarrulo <egarrulo@gmail.com>]

While reading about Ada on StackOverflow, I have stumbled upon a comment that said that:

    there are 2 types of programmers: the people who are actually really good
    at Ada and can do it right, and those that "know" Ada, but program it in 
    a way/style representative of the 70s with older languages.[1]

So, how do you become really good at Ada?  By studying well-written Ada
programs, I suppose.  Hence, what programs would you recommend as study
material?

Thank you.

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[1] http://stackoverflow.com/a/4028307/370132