Well don't get too excited!
Last time we did that gas prices went way up beyond $4 per gallon.
This would not be the time to pull out the gas guzzler and gulp gas to your heart's content. Au contraire my friends.
Keep doing what you are doing. Save your pennies for a rainy day. What comes down will go back up. The downturn in gas prices is merely a product of the financial troubles in the world markets. This too shall pass.
Remember, you are also starting to reduce your CO2 emissions. This is good. This should be continued. Keep riding that bus. Keep riding that bicycle. Don't stop walking. If you were about to buy a hybrid or an electric vehicle, go ahead with the transaction.
Reducing our dependence on foreign oil should be our ongoing goal not a "just because it hurts my pocket book" thing.