I just received my K10D a week ago. The most useful setting for me is the Raw + Jpeg setting. I bought a 4gb card for $55 and I can save 188 raw + jpeg images on it. For the pictures that turn out nicely and I want to make sure I maintain full image quality or to do a few minor manipulations, I work with the raw images. All others I leave as Jpegs that were processed in camera. Right now my image processing kind of sucks- I have Adobe Photoshop CS, which doesn't support DNG or PEF and so I convert my images into 16 bit tiffs (with the Pentax software) and then use photoshop to process. Eventually my husband plans on getting a Linux image processing system set up using Gimp. As a bonus, we have over 500 gb of hard drive space to save our images on
