http://bootsnipp.com/ & http://designshack.net/articles/css/20-awesome-resources-for... were recently posted here although they doesn't perfectly match what you're suggesting.

Couldn't a lot of these, including TFA, be pull requests to Bootstrap?

I'm the creator of Bootsnipp.com and I will put a nice centralized resources page on bootsnipp soon, right now I have all the resources in the Bootsnipp twitter account @bootsnipp. Hopefully that will be helpful!