Is there a Vim command invocation counter?

I'm looking for something to count keyboard command invocations in Vim, like the following for Emacs:
http://code.google.com/p/ergoemacs/source/browse/trunk/packages/keyfreq.el
The purpose is to record how frequently I use the various commands.

I'm interested particularly not only in counting aggregate usage of "d", "c", and "y", but also the individual motions following them, e.g. "dw" vs. "dW" vs. "dt." vs. "d$", and "j" vs. "gj", and particular versions of equivalent commands used, e.g. "d$" vs. "D".
Has such a program been published? I've searched but found nothing.

Also I'm looking for other people's Vim statistics to compare to my own, like the following for Emacs:
http://xahlee.org/emacs/command-frequency.html

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