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TortoiseSVN must be installed. The add-in was tested with version 1.3
Source code - compiling
The main source file is available here. You will also need this resource file. You just need to create a package project, add the main source file, build and install.
If you use Delphi 5 you can get already-made project files (check the "src" folder in the file section).
The add-in uses the "new" Open Tools API, so it compiles in Delphi 4 and above.
It can be easily (at least I think so) converted to C++ and compiled in C++ Builder, if necessary.