When running either program in hgsvn-0.1.5-2.fc8, I get the following error:

Traceback (most recent call last):
  File "/usr/bin/hgimportsvn", line 5, in <module>
    from pkg_resources import load_entry_point
ImportError: No module named pkg_resources

Installing python-setuptools fixes the problem.  My guess is that the hgsvn
package should explicitly require the python-setuptools package.  Or that the
automatic python requires generation has a problem that doesn't detect it needs
pkg_resources.