Recently, I discovered another graphical client for the subversion source control system.
Subcommander is a cross platform (MacOSX, Windows & Linux) client with diff and merge tool and integrates very well into Ubuntu, and supports much better subversions trunk, branches and tags layout.
Compared to eSvn it can browse and work directly with repositories, and has all features from kdesvn.
See also my previously post about subversion GUIs.
It can be installed from Synaptic, aptitude or apt-get, but unfortunately doesn't create an entry in the applications menu.