How Do You Keep Track Of Submissions?

How Do You Keep Track Of Submissions?

A couple of years ago I brought up this topic as I was searching for a solution for myself. I decided on Sonar, and so far it’s serving me well. However, I’m researching submission trackers for another project, so I figured I’d open up the discussion again.

How do all you writer-types keep track of your submissions? I know some are still using the old Excel spreadsheet solution, but what else is out there?

And if you were going to build the perfect tracker, what features would it include?