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Almost all the Python code I've written in the past year has been in Python 3. The libraries you mention have been ported already, as have many other important ones, such as sqlalchemy, lxml, httplib2, and imminently, Django.

Very early on I had plenty of headaches where some library I needed was Python 2.X only, but that's becoming increasingly rare.

Edit: s/eminently/imminently/

I think they already are: http://scipy.github.com/faq.html#do-numpy-and-scipy-support-...

Also, Python 3 will be shipped with the next ubuntu version https://wiki.ubuntu.com/QuantalQuetzal/TechnicalOverview/Alp...

A trivial search would show that they are on Python 3 (and have been for some time now).