[echohack]

I think demonstrating a set of features like this between a large number of langauges: say 20 to 50 would be a grand demonstration.

[VMG]

That's what http://www.rosettacode.org is for.

I agree that stackoverflow.com sometimes is a little too trigger-happy when it comes to closing questions, but we really don't need a community-wiki top answer with 1845 upvotes that is basically a rosetta code page, spawing dozens of copy-cat questions with slight variations on the theme.