Bartleby
Bartleby.com: Cavalier Lyrists: Sir John Suckling
This site provides a decent amount of biographical information on cavalier poet Sir John Suckling. It also discusses his poetry and attempts to rank his importance among his contemporaries.
University of Toronto (Canada)
University of Toronto: Sir John Suckling
This site from the University of Toronto contains the text of Sir John Suckling's "A Supplement Of An Imperfect Copy Of Verses Of Mr. William Shakespear's, By The Author."
Bartleby
Bartleby.com: Cambridge History of Eng and Am Lit: Sir John Suckling's Plays
Very brief and breezy excerpt about Sir John Suckling's plays. While he is better known for his poems, his plays do have some merit and deserve their status in the canon.