I think it would make more sense to make your list of hello worlds only with with languages that YOU know. I know around 16 programming languages. So I could make a neat little "hello world" list but one which mean something actually.
I like this suggestion - you get an opportunity to contrast / compare different constructs in each language that can provide similar functionality, and pick out special features that make it awesome. It's a bit like a code golf challenge, do the same thing in the most: elegant / performant / insane ways.
I assume folks have met the 99 bottles website (1500 languages)?:
I provided one of the GNU Make implementations, which lasted about a week before it was improved upon :)
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