ref card for data manipulation?

Tom Short's card is an excellent one but it does not cover high level
packages like plyr, reshape, DoBy, and a few base data.manip functions are
not there as well.

I'm not sure whether this can (partially) fill the gap, but Quick-R
[1] has a decent overview of data manipulation, and is essentially a
reference card. The maintainer of the Web site is open to
improvements, so it might make sense to contribute relevant
documentation to those pages.

Regards,
Liviu

[1] http://www.statmethods.net/

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