Last year I reported that the Denver Zine Library and the Papercut Zine Library were on hiatus. Boo! I admit, I cynically thought that was it for both of them, but happily I was mistaken. They both have reopened: Denver, Papercut. Yay!
(I know it looks like DZL's site hasn't been updated in a while, but I did meet someone who had been to the library in the last few months.)