Recently I was trying to look for some documentation on TK. I had remembered an older site, the book on TK, all very good information if slightly dated. Took me a decent amount of searching to remember- effbot.org, which also somewhat micro-famously went down recently due to the author's death. Makes me wonder what other very high quality resources will be lost in the next two, three decades as developers age...

RIP shirky.org, your insights then are just as good today