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For what it's worth, my startup (Mobile Web Up) uses Python 3 almost exclusively. Our core product is basically a very specialized web server built on Python3+WSGI.

There are some rough edges still. Our (marketing) website runs on Django, using Python2.7. There's been enough progress Py3k support for django recently that I'm hopeful we can migrate that by mid-2012. And I'd love to have solid Py3k support for a couple more libraries, like boto for EC2/S3/AWS.

All in all, for the particular things we need, Python 3 is practical now. We have paying customers whose services run on software written in Python 3.