OK - just checkin'. Yes, it's sensible to post jpegs of already blown-up RAW images. Just calibrating myself to the level of discussion - 'as you do'.
Do many cameras actually use lossless JPEG? The 'best' on my (albeit ancient) Pentax K10D shows a lot of artifacts fwiw. Wiki seem to say JPEG LS is used in DNG. It's a minefield and, whilst storage is so cheap and engines are so fast, why not use RAW?. It's all a lot better than going down to the chemists after your holiday to collect your enprints.