CVS is the most popular version control system available today.  It is robust and it is open source, so the software is free.  If you are not already using it, download a copy.

Browse the the free manuals.

What do you do if you need help using CVS or if you encounter a problem and don't have time to browse the free documentation?  Why, just call the CVS experts at Ximbiot!

Derek Price, CVS developer and technical editor of Essential CVS (Essentials line from O'Reilly Press) , and others offer consulting services and training through Ximbiot.