Resources
Online Tools
There are many excellent resources across the web for learning hymns, as well as why and how we should do it.
hymnary.org
A comprehensive online index of hymns and hymnals. Includes advance search tools and popularity metrics across hundreds of hymnals, with scans of every page.
congsing.org
This website contains an entire free book on the arguments for traditional hymnody in congregational singing, written by the excellent Drs. Drake and Munson (the latter of whom I studied under at Grove City College). The website also has textual and musical analyses of many of the great hymns.
Print Hymnals
Some hymnals and psalters I own and would recommend: