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something like the wall of superpowers (https://python3wos.appspot.com/) but for pypy is in order, i believe.

Most Python 2 code runs on PyPy without a port anyway. It would be more helpful to focus on specific pain points like getting connected to MySQL.

you could say that most libraries run on python 3, too. the point is checking for that particular library that you need in a single place.

I don't know how up-to-date it is, but there's this list of libraries and packages:

https://bitbucket.org/pypy/compatibility/wiki/Home

I'm mostly missing Qt GUI support myself. Hopefully cppyy (http://doc.pypy.org/en/latest/cppyy.html) matures, as then it will be possible to use C++ libraries automatically without none or very little binding work.

It'd be great to have a site listing this, but #pypy on freenode is a good place to ask such questions — there's normally something readily available (although in some cases only suboptimal solutions).