Interesting, sure, but incredibly hard to create with an uncoordinated Internet community. It'd take 1 good programmer/writer, ideally.
Without a clear, quantitative standard as to which Python* implementation is best, you'll find: a one-liner that claims to be 'pythonic', a 150-liner that's slightly more efficient, and a 30-liner that looks like it was written in C. The more popular the language, the wider the variety of responses. The more helpful the language (that is, 'newbies' can contribute solutions to otherwise difficult problems), the more solutions. The more divisive the language, the more bickering you'll have.
The Programming Language Shootout doesn't suffer this fate because it is 0% subjective. Discussion is only interesting with subjectivity, but technical discussion is presumed to be mostly objective. StackOverflow treads the line carefully.
1 writer could do it. 2, if they don't disagree on anything.
* I don't mean to pick on Python. Python is great. Insert language-of-choice
I don't think it would be that interesting - and I don't think we need to rediscover the fact that some languages use IEEE754 as the default number type over and over again
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.
