I'm a huge flac fan, but I have to agree with handful. There is virtually nothing to be gained by having flac on the N810. The N810's headphone out is so weak, I can't imagine why anyone would want to use their NIT to stream flac files. You'll need an amp to drive any worthy headphones with it, and to top it off, I haven't been extremely impressed with the sound quality from the N810. I haven't done extensive listening tests, but it seems to roll off the lows and highs prematurely. Take your flac files and rip them as ogg -q3. Enjoy the space savings and good music -q6 if you think you can tell the difference. Anything more is just a waste imho.