I've found through trial and error that a low res camera is just as good as a high res when it comes to producing orton style images. This quick image was grabbed with a cell phone of all things and worked in the orton style.
Love the impressionistic view of the world an orton style image produces.
To get there you make a duplicate layer, increase the exposure, slight increase to the saturation, and finally give it a little blur via the gaussian blur filter in Adobe Photoshop CS5. Then you take the layers and give them a multiply blend and voila you have your own orton style image.