The Victorian Web has many useful links for students of Victorian literature and culture. This is a link to the Victorian Web's Tennyson page.
The University of Rochester's library has a useful biography of Tennyson.
Compare two separate readings of the poem on this site. We think both are great, though quite different. Which do you like better?
Here's an image of Tennyson as an old man.
Here's an image of Tennyson as a young man.
An 1857 illustration of Tennyson's poem.
The British Library in London has an online exhibition with a page of Tennyson's manuscript of his long poem, Maud. We always think it's fun to check out a writer's handwriting.
This article is a good place to start for students interested in Tennyson's meter. (JSTOR login required. You may be able to access this through your school library.)
Here's an article by H. Sopher about the structure of "Break, Break, Break." (JSTOR login required.)
Here's an article by Irene Hsiao on grief and loss in Tennyson. (MUSE login required.)