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A Wikipedia article with a definition and simple example.
en.wikipedia.org
Pushdown Automata and Context Free Languages
An article with basic definitions and a proof that the languages accepted by PDA are context free languages.
homepages.fh-regensburg.de
Non-determinsitic Pushdown Automata
A definition of NPDA with examples and a proof that NPDA accept context free languages.
users.comlab.ox.ac.uk
Definitions and examples of deterministic and nondeterministic PDA and an example to show that the family of deterministic PDA is a proper subset of the family of nondeterministic PDA.
www.mathsci.appstate.edu
A site with a formal definition of PDA, some examples and a proof that PDA accept context free languages.
www.cs.nott.ac.uk
Introduction to Pushdown Automata
A lecture describing the limitations of FSA, introducing PDA and context free grammars.
www.dcs.shef.ac.uk
Notes for a linguistics course defining PDA and showing their relation to context free languages.
web.uvic.ca