http://www.intellij.net/forums/thread.jspa?threadID=274973
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When browsing SVN repository (Version Control => Browse Subversion Repository) it's currently impossible to view the files that were deleted. Restoring a file that was deleted in the past requires an "svn log -v" for the folder where it was deleted and then an "svn update" for the file with revision number.
If IDEA had an option to display a deleted files (colored differently, of course .. or with a line-through effect) and also a right-click -> "Restore file" option - that would be much more comfortable.