I might have discovered a way to make any LCD - even a newer one - more visible in strong sunlight, and therefore much more useful. Simply set up your camera to shoot RAW (for colour) + JPEG, but set the picture style for Black and White with a Blue Filter. What you'll then see as your picture preview will be a B&W with a blue tint, which seems to cut through the bright daylight when viewing your LCD a lot better. Don't ask me why, I think it just does.
Further, having your camera display in "Blue and White" so to speak, will help you in judging your composition if you want to know which shots to delete, or with a newer LCD-only camera, when actually composing the shot. Composition somehow just seems easier when you see it in any form of monochrome. For me, having the blue tint makes it even more helpful.
Remember, you want to be shooting in RAW + JPEG, because the RAW will still have your colour information. You're actually shooting in colour and black and white at the same time. Don't "compose for colour" so to speak - it really isn't necessary.