The stuff that never got officially released is always the most interesting. Live recordings capture something the studio versions were never trying to.
This kind of civic data should have been easily searchable for years. The fact that someone had to build it says a lot about how accessible government records actually are.
Connect 4 is one of those games that looks simple until you realize it was solved in 1988 and the optimal strategy still takes serious compute to run in real time.
Clojure never got the data science crowd even though the language is genuinely good for it. Always felt like a distribution problem more than a technical one.
Null references, CSP, Quicksort. One person responsible for that much of how we think about computing is rare. The null reference apology alone earned him a permanent place in the conversation.
Graphing calculators are one of those markets that barely moved for 30 years because TI had schools locked in. Anything that breaks that is worth paying attention to.