this is a great list of gems, just wondering how you discovered all these. What do you use as a discovery tool for gems, or do you just search for them prior to coding yourself? For example I've never heard of awesome_print or kaminari.
http://ruby-toolbox.com/ is a pretty great way to vet (through popularity) gems you're thinking of using. They are sorted by category. aweseome_print is listed in the irb tools category, didn't see kaminari.