Originally posted by Marc Sabatella Shooting RAW in no way whatsoever compels you to spend any time whatsoever on PP. You are welcome to just use the default conversion, and there is absolutely no reason to assume that won't be as good as the conversion the camera does when you shoot JPEG. But in the cases where you *do* decide to do custom PP work, then it is true you can get better results from RAW than JPEG. Whether it's enough better to be worth the extra space on the card is something only you can decide. But I find memory cards and disk space cheap enough that I can't find any reason to deliberate limit my option by ever shooting JPEG.
A big +1.
And there is no reason to waste memory space by shooting raw+jpg unless you have a pressing need for a jpg right then - such as uploading to the forum while on your trip :-) . You will be able to extract all the jpgs and/or convert all the PEFs later (assuming you have the Pentax software or buy Elements, or download faststone for free). Extracting the jpgs from the PEF files takes about 4 clicks and 2 minutes of processing time, total. Batch conversion will take longer, perhaps as long as going out to dinner and a movie...you can then spend a few seconds to a minute each on the images that need special attention, cropping or straightening. You would do that with jpgs anyway.
Jpgs are not more ready to use - they are more ready to view, is all.