Fiona 0.6.1, the version with support for coordinate reference systems (and undefined reference systems thanks to Ariel Núñez) is on PyPI: http://pypi.python.org/pypi/Fiona/0.6.1. I think it's ready for wider testing. If you've been able to install OGR's own Python bindings, you'll find Fiona at least as easy to install on Unix or Linux. It might be as simple as
The README has more detailed installation instructions for people like me with non-standard environments.
Update (2012-01-22): See http://pypi.python.org/pypi/Fiona/0.6.2