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It's a link to a pre-StackOverflow wiki/forum. Anyone have a list of useful links?

Not just a wiki, but the original wiki :) : https://en.wikipedia.org/wiki/Wiki#History.

There are pretty frequent links to it on HN: https://news.ycombinator.com/from?site=c2.com.

It's the tvtropes of programming.

The C2 Wiki is where I first learned about things like refactoring (http://wiki.c2.com/?ReFactoring), rubber ducking (http://wiki.c2.com/?RubberDucking), and DRY (http://wiki.c2.com/?OnceAndOnlyOnce).