You can use Bridge to sift thru Raws to look at them. It's slow to start and a pain.
You can use C1. It's cumbersome.
Instead of the above, use Coverflow with Leopard. Move to the folder where your files sit. In addition to icon view and list views, there's the Coverflow view (last of 4). Arrows will move you through the displayed previews. When you need to look at something in detail control-click on the file and open it with Photoshop.
Edmund