A colleague of mine agreed to using Subversion (SVN) for our little project, but only if he doesn\'t have to install it. He has a U3 USB stick where he keeps the project fil
I may be very late to answer. Another alternative which may be acceptable to some users.
Eclipse IDE is portable (not entirely, it depends on Java). Use the Eclipse SVN plugin (Subversive or Subclipse). This takes care of the daily needs.
You may choose to point to a Java Portable installation to make it truly portable. However I believe it might be slow to run off a usb pen drive.