Thanks to Muzak for this little tid bit:

1. Once TortoiseSVN is installed, create a folder where you want to put the source files.
2. Open the folder, right click (anywhere inside the folder) and select ‘SVN CheckOut’
3. In the dialog that pops up fill in the following URL:
4. http://svn1.cvsdude.com/osflash/xray/DEV_Source/xray and have a smoke or a coffee (or both).