I first read about the Instant JPEG from RAW (IJFR) utility on Scott Kelby's blog — it's a little program which lets you extract the embedded jpeg from any RAW file. It works on DNG files, too, if you're in the habit of converting your RAW files.
Once installed, all you have to do is right-click on the file(s) and extract the jpeg.
Every RAW file has an embedded jpeg, so with this handy little tool you won't need to shoot in RAW+JPEG any more. It'll save you space on your flash cards and hard drive. Plus, it's free!