* For distribution, I just have a website. I also put it up on the Apple downloads listing, which is where most of my traffic comes from.
* A bunch of other sites pull data from Apple's listings, so I get traffic from there too.
* More updates = more traffic = more sales, because each update gets you near the top of the download sites
* Sales are done through PayPal, which is really easy to setup
* Support email isn't bad at all, maybe 1 email every other day
* The free trial limits the amount of data you can enter, rather than a time trial. That way users can try out future updates too.
* When a major site did a post about it, sales AND feature request emails spiked. But after a week, it goes back to normal.