Subversion - SVN
Over the past couple years I have written a large number of various scripts and programs, mostly in PHP. Some were just to test concepts, but others had working and useful bits of code. With this large number of files and directories to keep track of it is easy to mess something up, such as forgetting to backup part of it. Oops.
You will notice the domain http://projects.abstractflow.com, which is like some sort of manual source control operation. Well, unfortunately, it sucks. The truth is I was simply too afraid to get into the complexities of true source control with SVN. No more. After losing a payroll application that I spent several hours writing, because of a silly backup mistake, I realized I would absolutely need to start using source control before anything else went wrong.