Since I've been using the Leica X1, I have been using DNG and also importing the jpeg files, as well. This particular camera cannot be set to record only DNG. I find that these DNG files are wonderful, and often so are the jpegs... It's all pretty much a no brainer. Meanwhile, I've got my E-PL1 which uses ORF the Olympus RAW file...now with Lightroom I'm wondering about the best way to import files. Should I import as DNG, can I, can you explain to me what sidecar files are, etc., or point me to a nice, not too technical place to get a better understanding? Or perhaps, I should just choose the option to convert on import to DNG and not worry about it?