Discussion in the thread "Dialog titles"  indicated that the Repository Browser should show the working copy path in the title when started from a working copy. That is not the case as of TortoiseSVN 1.6.99, Build 21390.
Steps to reproduce:
1. Checkout a working copy of the TortoiseSVN project.
2. Navigate to the `contrib` directory in Windows Explorer.
3. Start the Repository Browser.