Michal, I'm seeing this on fc8 with a custom built python2.6. Not happening with any other packages (e.g. boto). Workaround of course was just to copy the S3 dir to /usr/local/lib/python2.6/site-packages. I poked around a bit but nothing obvious jumped out. Happy to do any debugging if you have tests you'd like to me to run. -Omer