… wasn’t at Web 2.0 at all but instead at Web 2.1.
You put in text and it suggests tags. It does this by comparing the text to tags on other text via Del.icio.us and two or three more sources.
It was created by Adam Kalsey, ex of Pheedo, only last Wednesday, so it has data only since then. Even so, it’s very good.
It’s a clever use of reverse-folksonomy: Use the wisdom of the crowds to make your stuff wiser.
I would have liked to have kept this secret to myself for a few days while I figured out how all it could be used. But just now, I showed it to my son and he said, “Seen it.” It was already dugg on Digg.