[wanderfowl]

What are you passionate about? Start there.

I'd rather see an article describing, in detail and with passion, your particular [esoteric computer configuration], than the most requested topic in this thread. If you don't want to write about X, then no matter how desired or profitable it would be to do so, it's probably not going to be a great article.

My advice would be to write what enthuses and interests you. And if nothing in that domain is something you feel should be written, then maybe consider finding a different outlet for your creative energy. Nobody's forcing you to start a tech blog :)