It used to be hard to get, but now places like Whole Foods and my local Harvest co-op sell it, and even Honest Tea (owned by Coca-Cola) and Celestial Seasonings have their own versions, fortified with B vitamins, vitamin C and spirulina. There are even kombucha martinis and kombucha smoothies.
I'm into it for the probiotic and detox elements, but it can get dangerous. As in, don't-get-stuck-in-traffic-after-you've-downed-a-glass kind of dangerous. There have also been some negative reviews on it for folks with weakened immune systems.
There's a great tutorial over at Healthy Living How To if you're interested in brewing your own. But knowing how it's made kind of grosses me out.
Anyone else in love or in hate with Kombucha? I haven't made up my mind yet...