Calls To Action - Left or Right?

Which is Best?

I've been involved in a great conversation with John Quarto-vonTivadar over at Future Now about the best place to put calls to action.

It started after John and his friends saw online retailer, Crutchfield, had put all of its shopping cart call to action buttons on the far left of the screen.

This started a whole debate on where the preference for right sided calls to action came from, how to test them against left sided ones, and the total influence of design elements on the buying process.

Some very smart people have contributed to this conversation, so it's worth checking out.
Testing Add-to-Cart Buttons: Stuck in the Middle With You

We haven't come up with any definitive answers yet, but the discussion is lively and has brought a whole range of interesting points.