Technorati has dug up a list of items on IronPython at PyCon this week. I've not consumed any of them yet, but hopefully they will be enjoyable.
It looks like the new release of IronPython depends on the Yukon CLR. So for now it looks like CPython with the Python.Net assembly bridge is the approach of choice for "real" uses. With a bit of care Python code could then port over to IronPython.
Not sure what the language level of IronPython will be vs. CPython when Yukon is released.