The smplayer SVN repository has been moved to assembla:
To get the whole repository:
svn co https://subversion.assembla.com/svn/smplayer/ smplayer
To get just the development version:
svn co https://subversion.assembla.com/svn/smplayer/smplayer/trunk/ smplayer
To get just smtube:
svn co https://subversion.assembla.com/svn/smplayer/smtube/trunk/ smtube
If you need write access, register in assembla.com and then send me your username, so I can add you as a member.