This very useful site contains Hughes's biography and bibliography, along with links to his poetry, his contemporaries, and critical scholarship about his work and about that era. It also has a link to an audio clip of Hughes reading his poem "The Negro Speaks of Rivers."
If you're writing a paper, this site is great for finding secondary sources. It contains links to articles about Hughes written by a variety of authoritative sources, including his biographer Arnold Rampersad. It also has some obscure primary documents, like a scanned image of one of his newspaper dispatches from the Spanish Civil War.
Pittsburg State's outstanding online resource on American jazz in the twentieth century delivers yet again. This page looks at the Harlem Renaissance and its notable contributors, including Langston Hughes. It has links to works by and about Hughes as well.
This site, sponsored by the Library of Congress, has a timeline of events in Hughes's life along with info about his biography and poems. It's targeted to slightly younger readers but, hey, short words and bright colors never hurt anyone.
This site, sponsored by the Kennedy Center for the Performing Arts, leads you on a tour through the Harlem Renaissance. Here you can learn more about Langston Hughes's contemporaries in literature, art, and music. Each artist's biography shows his or her links to other artists. By clicking on Zora Neale Hurston's page, for example, you learn how she and Hughes wrote the play The Mulatto to combat racial stereotypes.
This multimedia site, created by John Carroll University, is an interesting introduction to the Harlem Renaissance. In addition to the era's well-known contributors to the worlds of music and literature, the site also highlights lesser-known aspects of the period such as religion and education.