Most post-processing software have a Saturation slider.
I should have been more specific. I'm looking for ways to do it out of camera, without using RAW or doing PP. I've edited my OP.
I often find myself in a situation where I have to take a lot of photos for friends, colleagues or other kids. I want to take nice photos out of camera and just distribute them immediately through online sharing without having to do any PP.
You want more saturation then what the camera will produce but you dont want to put in more work in post. Seems rather impossible to me.
Even in film days people did things in post to enhance the photos.
If you have photoshop (or get PS if you dont have it) you can batch process files together. It really doesnt take that long.
And shoot raw at all times! Why else do you have it.