Evangeline has been rolling from her tummy to her back for several weeks, but on monday she started rolling back to front, which is much harder. She can also scoot around on her back or her tummy, and she gets pretty far. I can no longer leave her laying on my bed, or on the couch while I run to the bathroom, or to do something quickly. She has to go with me, or hang out on the floor. She just scoots until she runs into something that stops her, or until one of us picks her up to go back on her blanket.
Here is a photo play by play of the rolling action. Starting out on her back. her first move is the arched back for lift-off.