As a cvs user, sometimes I create a sandbox for a specific date and time. Then three months later I got back and wonder, gee is there anything important left in my source tree I want to retain? I didn't know how to do that until yesterday. Thanks to Larry T. for setting me straight.
cvs release -d <dir>
This will report the state of any files and prompt you to delete the directory.
See the CVS docs on the topic for more info.
