Steve Goddard at WattsUpWithThat.com does a great job of explaining why the pro AGW argument that Venus is an example of a runaway greenhouse effect, doesn't work.
Highlights:
Nearly 100% albedo (amount of sunlight reflected back to space). Greenhouse effect needs to warm the planet then reflect that heat back to the atmosphere where it is slowed down by GHGs. However if sunlight cannot reach the planet it can not heat it, thus it can not heat the atmosphere.
Earth has 1000x greater atmospheric concentration of water vapor. Water vapor is the most powerful greenhouse gas, yet Venus barely has any.
Venus' atmospheric pressure is 92x greater than Earth. Think of a pressure cooker.
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