For a couple of years I have been running into this alternate source control system called Subversion (SVN).  After reading a couple of more glowing testimonials today, I decided to find out what the buzz was about.  And now I know.  SVN handles deletes, renames, and moves better than VSS -- and better than CVS (which is easy since CVS cannot handle such things).  I am going to migrate to SVN as my personal sccs.  Migrating SSI might be more difficult, but not impossible.