Falling Gas Prices

I've been riding my bike a lot lately, so I was pretty surprised when, during one of my rare drives a few days ago, I noticed that gas prices had dropped to about $2.25 per gallon. I'm pretty sure that's the cheapest it's ever been for as long as I've been driving. I have vague, foggy memories of gas for less that $2 per gallon when I was a kid, but I never thought I'd see anything similar ever again.

What does all of this mean, though? I'm not sure, but I have some thoughts.