Absolutely, and I love Gwern's article as well. I use it for random facts, remembering faces, pretty much anything I learn academically that I can (economics, maths, etc), as well as studying some "lists of facts" just cause, like the location of all the countries in the world.

It's also an amazingly designed piece of software in terms of functionality, even if it does have a bit of a learning curve.

Honestly, my only complaint is that I can't figure out how to give them money! I'd love to donate to them but can't seem to :(