Lists of Cardinals

New Advent has a great list on its home page of the Cardinal Electors, grouped by "Most mentioned as Papabile," "Occasionally mentioned..." etc.

For each Cardinal there are direct hyperlinks to biographical and other information on the official Vatican website (as well as certain caveat lector sites).

UPDATE - Additional lists of the Cardinal Electors can be found at www.catholic-hierarchy.org, The Cardinals of the Holy Roman Church, Agencia Católica de Informaciones en América Latina (Cardenales Electores - en español; Cardeais Eleitores - em portugues), La Stampa (I cardinali elettori - in italiano), inter alia.

(Hat tip to cnytr RE: one of the 'caveat lector' sites)