[raylu]

Have you considered swapping Esc and Caps Lock instead? Caps Lock is not very useful so tossing it into the corner makes sense to me.

[Kluny]

You can do both, actually. Using KeyRemap4Macbook, my esc is now capslock, and my capslock is ctrl if I use it with another key, such as ctrl-s, and esc when I use it on its own.