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The History Cat
The History Cat: Invasion of Poland: Appeasement and Nazi Aggression
Describes the events leading up to the invasion of Poland and how it occurred.
The History Place
The History Place: The Triumph of Hitler: The Nazi Soviet Pact
Describes the alliances that were forming between countries in the lead-up to the outbreak of World War II, the negotiations between Hitler and Mussolini, and the Nazi-Soviet Non-Aggression Pact signed by Germany and Russia.
Internet History Sourcebooks Project
Fordham University: Modern History Sourcebook: The Molotov Ribbentrop Pact
This site from the Modern History Sourcebook which is provided for by Fordham University contains the text of the Molotov-Ribbentrop Pact, the Nazi-Soviet Non-Aggression Pact.
Wikimedia
Wikipedia: Molotov Ribbentrop Pact
An information-packed encyclopedia article from Wikipedia on the Molotov-Ribbentrop Pact presents a good summary of the events that led up to the signing of the pact. There is also a link to the text of the pact.