A lot of people like switching caps and control. In fact I did the same for about a year before someone pointed out to me that it makes more sense to use the thumb for Control.
I also researched this topic a bit. Here's the keyboard that inspired Control, imho, to become the most used modifier:

The venerable LISP machine keyboard, the Space Cadet.
I found that using Caps as Control was a huge improvement, but my pinky got tired. Moving it next to the spacebar improved my finger fatigue tremondously. It takes a little getting used to, but after that it just feels so much better using my big fat thumb for this most used of all modifiers. In fact, I don't really get why the HHKB puts control at caps (I think it's been badly inspired by the Sun keyboards).
So the bottom row of my keyboard looks like this now:
CONTROL ALT CONTROL SPACEBAR CONTROL ALT CONTROL
I leave the original control for other people that use the kb.
Mac keyboards are similar as well... Command is right next to the spacebar. I think this is a good design.