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Like kane said, I keep mine a bit lower than most people I know, not to save money, but because it feels comfortable to me. My wife likes it warmer, but she is, um, frugal, so she doesn't mind the lower temp.
BUT a lower temp doesn't always mean that one is saving money. A lot of variables come into play - namely, size of living space and size / age / and functionality of furnace. It might even be cheaper to keep it warmer than you have it now (especially if your furnace is overkill for the size of your living space).
A furnace kicking in and shutting off every five - ten minutes probably uses more energy than the same furnace running 15 - 20 minutes straight so it does pay to experiment some.
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