I'm not a programmer, but I would definitely like a simple way to control versioning. I use text mate for HTML, CSS, and basic PHP. I personally hate Apple's versions, and they have caused problems, so I disabled them in apps that had them on by default.
Being not very technical when it comes to certain things, I have never used Git, Mercurial, and don't know where to start.
If some simple versioning system was put into textmate, I would use it right away. The ability to show differences between versions would be great for things like HTML and CSS, and highlighting would make that easy. We would need the ability to control the highlight color (background color and text color) since we all use different syntax highlighting themes.
thanks