here are some detailed instructions for Linux (tested on SL5 and OpenSuse)
svn list svn+ssh://svn.cern.ch/reps/siddbd/trunk
should say
Chapter_Benchmarking/ Chapter_Calorimetry/ Chapter_ConceptOverview/ Chapter_Costs/ Chapter_ElectronicsDAQ/ Chapter_ForwardSystems/ Chapter_Introduction/ Chapter_MDI/ Chapter_Magnet/ Chapter_MuonSystem/ Chapter_SimReco/ Chapter_Summary/ Chapter_Tracker/ Chapter_Vertex/ DBDMain/
then just do
svn co svn+ssh://svn.cern.ch/reps/siddbd/trunk <Your chosen Directory Name>