SvnX is an open source GUI for most features of the svn client binary.
It allows you to browse your working copies, spot changes and operate on them but also to browse logs and revisions of your repositories !
It's written using Panther's new bindings mechanism for maximum flexibility and user experience.
Repository Inspector :
Browse logs, revisions and directories in a single window.
svn checkout, svn export, svn import, svn switch, svn copy, svn mkdir and svn delete support.
Drag & drop between the repository browser and the Finder ! (both ways!).
Disk cache for impressive speed.
Working Copy Inspector :
Flat view / hierarchical view.
Operate svn actions on selected items.
svn move/copy via drag&drop in hierarchical view.
Save your favorite working copies in a panel.
Not yet implemented :