I'm not a big fan of good old table sugar. The flavor is ...boring, and not worth the calories, not to mention the headache I get from it. I don't know if it's the sugar itself, or the chemicals involved in processing and refining it, but sugar = headache within about 15 minutes.
As a result, I usually use one or another sugar substitute to sweeten my tea and coffee - either Splenda or aspartame (Nutrasweet), not Sweet-n-Low, which has a funny aftertaste. But I'm always open to trying new things, and in moderation, other sugar alternatives don't bother me.
So when my local Market Basket started carrying a xyltiol-based granular sugar substitute that looks just like sugar, doesn't degrade with heat, is all-natural, and has been shown to reduce tooth decay by up to 70% (just ask Wikipedia), I was pretty excited. Check it out - it's sold under the brand name Ideal.
There's also the old standby, honey, for tea; it adds flavor and sweetness. It's no so great for coffee, though; the flavors don't agree, in my opinion.
Instead, I've started using Agave nectar, a syrup becoming more available as it appears in Stop and Shop and other large grocery stores. Agave is the cactus originally used to make tequila, but its juice is a rich and delicious source of a soluble fiber called inulin, now used as a supplement in products like Fiber One's granola bars. The juice's fiber breaks down into sugars as it is processed into syrup for sweetening. It's pretty affordable, and adds a caramel-like flavor and enhanced body to any coffee. It's also got a gram of fiber in every spoonful!
So check out your local grocery store; you might find some sweet surprises!