What has consistently me money is getting companies published and featured in Forbes. I consistently make $10k to $20k per month, depending on how many people I speak with on any given month.
Second to that is finding physical products cheap and reselling them. This is harder but its still consistent, as long as I find something I can buy for much less than its worth. I've had $2k days with this, but its a little more random.
I do offline stuff too, but this is the only thing I do online. What about you? What has consistently made you money online?