tabby, I've also updated the article to mention the fact that KEYS may not be a solid use of the system. I would appreciate any feedback!
I'm a big fan of Redis, and it's a key component of our stack. Sorted sets are useful for a lot more than just leader boards, though that is a good use case for them. It's a bit late here, so I'm not feeling up to writing a big post, but I'm considering writing my own blog post on my experiences with Redis.
I'm new at blogging, so I'm trying to take in everything and produce the best content I can, so I love the feedback!
I would love to see a follow-up article too by the way!