Callie,
Left-over coffee is actually very versatile. At the restaurant I work at, we make our iced coffee with our left over coffee, so if you like iced coffee, just put it in a pitcher and in the fridge. You can also add some flavorings like caramel or chocolate when serving.
As for more creative uses, left over coffee is great for making coffee ice cream, cakes, brownies, cookies, almost any desert really.
And even though this sounds odd, marinating a steak in a little coffee, and then later encrusting it with pepperocorns and a little ground coffee make for a wonderful flavor.
Oh, and about freezing the coffee. If you aren't going to use it within one or two days, then I would definately freeze it. Maybe even partition it out if you have a lot.
Hope that gave you some ideas.
Gruss,
Jason