There’s a wonderful application for the Mac called TypeIt4Me that does instant macro expansions as one types. I first learned about it at a No Fluff Just Stuff technical conference when some of the presenters were using it to give some slick presentations.
I’m a big believer in try-before-you-buy, and have long advocated using the 30/30/30 model for generating sales.
Here’s evidence that my bang-for-buck ratio was pretty low:

The problem? At the time, I just couldn’t find just the right need for it within my own workflow. But you can see, I kept it around.
However, because the software didn’t shutdown and lock me out, which would have gotten it deleted, it was there the moment I had need. And, Ettore Software got a sale.