What can I use as an alternative sweetener for smoothies? I make fruit smoothies often, and started off adding sugar. I'm looking for a more "natural" sweetener though. I know I can use honey, but it adds a distinct taste that I'd like to avoid. I've tried using dates as well, and it's a workable alternative, but also changes the taste slightly (and makes the smoothie "stickier"). What are other natural sweeteners to try, preferably that don't make a big difference to taste?
You could try agave nectar -- but I'm not sure if it will be that much of an improvement over honey. A tiny pinch of salt might also help make the smoothie taste sweeter.

Usually though, if I want my smoothies to be sweeter I just add more juice or fruit (e.g. ripe berries, peaches etc).