I was in Fairway a few weeks ago and they had agave syrup on display. I wanted to see what the fuss was about, so I bought a bottle of the light amber. I took it home and ate a little bit off a spoon and decided I liked it quite a bit. I put the following together:
1 T agave nectar
Juice of 1 lime
3/4 oz vodka (one shot) I happened to have some Chopin in the house
stir all ingredients together and pour over ice. Fill the glass up to the rim with seltzer. Toast to finishing the workday without screaming.
I do feel obliged to mention that agave is NOT, according to any health journal I've looked at, a non-caloric or low-glycemic substitute for sugar. You'll see claims that it's "sweeter" so you might use less. According to this article by the Mayo Clinic, it does trigger a need for insulin. I am not a medical professional, consult your doctor, et cetera.