When someone's at home, at 69 or seventy. When not, around 65.
Thing is, my dad works either monday-wednesday or thursday to saturday with alternating sundays, so more often than not, somebody's home and the heats at 70.
I don't think our bill's too bad, though(I'm just the kid, I don't see it). We did get at least a digital thermostat, so we've been keeping it more constant at a lower temp than we used to. We haven't gone programmable, though - my dad's work schedule changes too much, and my parents aren't technically minded enough to want to bother to change it all the time.
edit: And in the summer, about 72-73 when the AC's on. But we're a throw-open-the-windows house, so we'll crank it up to 80 or so and open the windows quite frequently as well.
aaand another edit:
eldy, better you than me. My grandma does that, it's like suffocating every time you walk into her apartment.

Do you pay your own heat bill, or is it included in your rent?