...slowly. 
...backwards. 
...sort of. 
She does a big push up lifting her torso and then pushes off with her arms sliding her back half across the floor about 4-6 inches at a time. Last night she actually went about 2 feet or so before running out of room and then getting really mad about it. She does nothing at all with her legs during this motion. Apparently she did a whole bunch of this at Early Days today.
Mark her age at 8 months and 1 day.
Watching this, we're probably going to have to keep an even closer eye on her. Although she isn't going to win any races with this technique, it's about perfect for wedging herself under pieces of furniture. While she hasn't done that yet, knowing her, we wouldn't be very surprised if she did.