So what products can I make that might be of interest to others here? My one idea is to write articles or guides and have people tip BTC if it's helpful.

What kind of things do people want (legal stuff only) that are hard to get? What kind of stuff do you want, but can't find anywhere?

I'm just trying to see what folks would like to spend BTC on. Amazon and eBay give you the chance to buy almost anything these days.