Contributor(s): Dan Haig.
The very brief explanation of how to make a symlink in Subversion is that you need to checkout the repository (or concerned parts thereof) using command line on a unix server, create a symlink directory as per usual in unix, svn add the new symlink directory, then svn commit it.
It is not possible, so far as Doug Chestnut and I have determined after many trials, to make a symlink using the TortoiseSVN client or any other gui client we know of, whether Windows or Macintosh.
There is as of yet no general instructions in our documentation to explain how to work with subversion via command line; if you don't know how, you will need help to make the symlink anyway, so ask Than Garson (ndg8f) for help.