I've recently started writing for LWN and have written nine articles now: https://lwn.net/Archives/GuestIndex/#Hoyt_Ben It's definitely a stringent style and editing process -- I find it good discipline. Most of my articles have taken a full day to write (8-10 hours) plus an hour or two of editing, though a couple of them took two days. So not a get-rich-quick scheme, but also not bad (or you can think of it as them paying you to research and learn :-).

I've really enjoyed the process. It's nice to have an article done and dusted, and then you don't have to worry about it anymore. Unlike code, which keeps breaking, you have to maintain it, deploy it, add features, etc. Code is never done. But an article gets published, and (apart from reading a few comments) that's the end of it.

So I highly recommend subscribing to (or writing for!) LWN. It really is quality content. And I'm not even an avid Linux person. It's really inexpensive for what it is, and they're just a small shop so they deserve it (I think they only have 3 or 4 full time writers).