In my September post, I wrote that we upgraded our development environment from Subversion 1.4 to Subversion 1.5. We were hoping to use relative URL's in svn:externals property - the feature introduced in Subversion 1.5. We use svn:externals to connect to shared non-compilable release units, such as common styles, images, script libraries, content, etc. We immediately found out that although Team City 3.2, our build and integration server at the time, supported Subversion 1.5, it did not recognize relative URL's in svn:externals. We have recently upgraded our build server to Team City 4.0 and it does support relative URL's in svn:externals!
Contact me if you have any questions on how to structure your Subversion repository. Happy coding!