I'm not sure one can say this mouse is not ergonomic because some people have trouble using it. I have used both the Apple Mighty Mouse and the Magic Mouse and I much prefer the Magic Mouse. I use one daily and I never get cramps.

I never get cramps either and as a contributor to both Apartment Therapy DC & Unplggd - I'm using it a lot. I've never left the office with a cramped hand. I think it's fine just the way it is.

It's sad that this is a good idea. Damn you Apple!

Well it's a good idea until you begin to experience pain.

Anytime you are holding on to any mouse like in this picture, you are wrapping your tendons up like a rubber band. I have two cool exercises that will really give you an idea of how much damage you can do while mousing with a standard non-ergonomic mouse:
1. shake both of your arms out and come to a relaxed position. Now slowly move your hand up in the same relaxed position. As you will notice your hand is more in a handshake position. that's how you should mouse. Drop your hands back to your sides and now put them in the position you would mouse in this picture. Take ten steps with your hands in that position (OUCH). On a side note. Look at your shoulders when you twist your hand in the standard mousing position. The rubber-band tendons push your shoulder forward. BAD NEWS!

The second is a quick one we do all the time to demonstrate the potential injury caused by improper keyboarding and mousing: Grab a pencil or pen in your hand. Put your elbow to your side and slowly move the pen from a vertical to horizontal position (OUCH).

Well that's you typing and mousing with all these cool keyboards and mice. here are a few mice we highly recommend:
http://ergoprise.com/top-picks/evoluent-vertical-mouse-4-right-hand-wired
http://ergoprise.com/top-picks/handshoe-mouse-wired
http://ergoprise.com/office-ergonomics/ergonomic-mice/goldtouch-mouse