Other
The Eighth Amendment
This is a student essay on the question of whether capital punishment is "cruel and unusual punishment" under the Eighth Amendment.
US Government Publishing Office
U.s. Government Publishing Office: Eighth Amendment Further Guarantees in Criminal Cases [Pdf]
This resource provides the various court rulings as to what has been interpreted as "excessive bail", etc.
Siteseen
Siteseen: Government and Constitution: 8th Amendment
Short, simple summary with the full text of the 8th amendment of the Bill of Rights stating limitations on imposing excessive bail, excessive fines, or any cruel and unusual punishments.