PainlessSVN uses an open sourced library to "objectize" Subversion's command-line utilities. I have it listed on both SourceForge and CodePlex. I just started using SvnBridge to talk to CodePlex. CodePlex is oriented towards .NET projects, so I thought it natural to host the bulk of releases and work items over there.
The changes in SVNManagerLib bubble up to PainlessSVN. I'm hoping to also power the upcoming XML-RPC server, that will allow me to make PainlessSVN work across WANs. I'm leaning towards XML-RPC, because it is a well known protocol and works very well in non-Windows environments. My goal is to have this running under Mono at some point. This will allow admins to run Subversion on Linux (and any other OS that supports Mono) and the front end on Windows. I have a friend that is creating a front end for the Mac.
Here's the URL for the CodePlex project:
http://www.codeplex.com/svnmanagerlib