Websites
Hopkins at Bartleby

A nice, reliable resource.
Hopkins’s Grave

Gerard Manley Hopkins was buried in Dublin, Ireland.
Music anybody?

These guys are dedicated to putting Hopkins’s poems to music.
Video
A Beautiful Reading and Commentary

By celebrated poet, Stanley Kunitz
Hopkins in Brief

A reading from a biography
Audio
Hopkins on LibriVox

Lots of Hopkins’s poems, in audio format.
Images
Portrait of the Artist

An artist's take on Hopkins
Historical Documents
"The Ecstasy of Gerard Manley Hopkins"

A 1989 New York Times article
Hopkins’s Letters

This link shows you Hopkins’s letters, and talks about "sprung rhythm."
Books
Gerard Manley Hopkins: A Life

We don’t need to tell you that this is a biography.
Gerard Manley Hopkins and the Victorian Visual World

If you feel like you’d have been happier in Hopkins’s time, maybe this is the book for you.