How to access Physical Constants in Mathematica 9.0?

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With version 9 physical constants are included in the system with units as a “Quantity”. For instance, to input Planck’s constant you type:

Quantity["PlanckConstant"]

This form can be discovered using an inline Wolfram Alpha query. To get this you type ctrl+= and then input some free-form version of your query.

Example.jpg
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Note that I misspelled “Planck” and the Alpha query still worked. Alpha is pretty good at determining your intention.

I would prefer a palette for inputting these constants as well as for units. I have written such a palette for units and described it in a recent post here , with a download link for that palette here.