doublet:
This idea has been stuck in my mind for some months: an Arduino magazine? Why not?
So, in short, I'm looking for opinions and other ideas
I assume you are sitting on a pile of money, and its burning a hole in your pocket?
The truth is, starting a magazine is hard and expensive work; have you done your research as to your target market, how many of them purchase magazine subscriptions, which ones they currently subscribe to, etc?
Do you know about your competion? You have Make, Nuts and Volts, Servo, and several others to consider; no, none of these are focused on the Arduino exclusively (or at all), but they -are- your competition, so you need to keep them in mind - mainly as to what makes them successful, how do they draw in the readers, how can you compete with them, etc.
These days, you also need to build a community around your magazine, and that means social networking and a good website. This costs money - quite a bit of money. You're probably looking at around $20K USD for the website development (complete package, actual development company, plus the marketing, etc) alone.
I'm not saying it isn't possible, nor that it isn't a good idea (I'm kinda surprised it hasn't been done yet, in all the years the Arduino has been around - makes you kinda wonder "why?" - you should look into that) - but there does need to be a reality check.
I don't think it would be worth trying unless you had about $100,000 USD to kick it off - that would be "to do it right" (ie, getting an office, hiring staff, building the website, marketing, etc). Even then, it could be a crapshoot...
Good luck with the project; I'd probably subscribe myself (or at least pick up an issue - I don't consider myself a beginner, per se, but I would be interested in such a magazine).