Der Rosenkavalier
The most acclaimed recording of Der Rosenkavalier is the one conducted by Herbert von Karajan for EMI with Elisabeth Schwarzkopf, Christa Ludwig, Theresa Stich-Randall, and Otto Edelmann.  Nicolai Gedda sings the Italian tenor's aria.  Available from amazon.com.
My favorite visual version of the opera is available on DVD from amazon.com.  It stars Felicity Lott, Anne Sofie von Otter, Barbara Bonney, and Kurt Moll.  Anne Sofie von Otter is especially outstanding as Octavian.
Ariadne auf Naxos page
Opera Pages johnrpierce.com

Der Rosenkavalier: Vocal Score: (Sheet Music)
at Barnes and Noble

Der Rosenkavalier: Libretto, in English & German: (English National Opera Guide Series #8)
Der Rosenkavalier: Libretto, in English & German: (English National Opera Guide Series #8)
at Barnes and Noble

Karl Böhm conducts a DG recording with a cast including Irmgard Seefried as Octabian, Marianne Schech as the Feldmarschallin, and Rita Streich as Sophie, that can be ordered from amazon.co.uk.
Rosenkavalier
video (for U.S. and Canada) with Elisabeth Schwarzkopf,
Barnes & Noble

Rosenkavalier at gemm.com
Der Rosenkavalier:  Vocal Score, at amazon.co.uk
Rafal Olbinski - Der Rosenkavalier
Der Rosenkavalier
Rafal Olbinski
Buy This Art Print At AllPosters.com
Strauss: Der Rosenkavalier / Pretre, Janowitz et al.,
Opera d'Oro
arkivmusic.com