...and a small explanation of why that's important to me.
In 2009 I became immersed in the world of check image files, often referred to as "Check 21" files, in reference to the Check Clearing for the 21st Century Act, which gives a scanned image of a check legal credibility as a financial instrument. In our modern world of online bill pay, web 2.0, and pizza boys with credit card scanners that plug into their mobile phones, paying utility bills by mailing a check is slowly becoming anachronistic... or so you might think.
In reality, over 300,000 physical checks per month get mailed to our Canton remittance center, many from businesses with multi-thousand dollar electric bills - businesses large enough to employ an IT department to do ACH transactions, wire payments, what have you. But the physical checks keep being printed and mailed, for much the same reason that companies that have ever used a mainframe continue to use them despite the cool kids shouting "dinosaur!" or "RESTful!" or "node.js!!" at them: It's well understood and works reliably.