Collabnet offer CollabNet Subversion which is a set of certified binaries and Subversion support and training.
Here's how to build svnmerge as a Windows binary and then create an installer for it.
Subversion Python bindings for Python 2.5 are not currently available.
You will need the following installed on your machine (as of Subversion 1.4.3 and done on 1 February 2007):
SVNCOM is two COM objects, SVNClient and SVNAdmin which give programmatic access to subversion functionality from any language (on Windows) which supports calling COM IDispatch interfaces.
Links to sites offering Subversion binaries.