I think this would be a good idea in general and i only have two criticisms:
1) I think the links should be more perl centric. E.g. a [syntax://grep] that links to the onsite perl documentation.
2) Your suggested links (whatis.com, dictionary.com) are offsite and would provide a rather disjointed experience for the user so I think it would be better to keep the links onsite.
Other than these i'm all for your idea.
~~rob
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eval pack "h*", "072796e647022245d445f475454494c5e622b3";