First Impressions
I tried to draw a bike. It looked like two potatoes and a stick. AutoDraw recognized it and suggested a library of professionally drawn bikes. I clicked one, and my doodle was replaced by vector art.
Best Feature: Prediction
The speed at which it guesses what you are trying to draw is impressive. It makes creating icons or simple flyers accessible to non-artists.
The Verdict
An oldie but a goodie. It's the best way to get quick clip-art that matches your intent.