Moving Directories with History
Tortoise SVN supports 'Right Click' move in the Repo-Browser. When you drag the source file/directory into the destination using 'mouse right click' a context menu will appear. You can select the appropriate menu option for copy/move/move-rename etc. This option will preserve the history as well.
Note: There is a nice fature called 'Repair Move' in Tortoise SVN - by using this feature you can rename the file/directory when you move it. (Refer to Documentation for more details)
svn help rename
Moving/renaming in subversion keeps history intact.
svn move SRC DST
$ svn move -m "Move a file" http://svn.red-bean.com/repos/foo.c http://svn.red-bean.com/repos/bar.c
svn move will keep your history.