Recently we've started to find Ella sitting up in her crib in the mornings and after naps, and yesterday she crawled a few feet on her belly to reach a toy without crying even though we were all sitting nearby in the living room. The only thing that has motivated her to crawl in the past is to reach one of us, but yesterday she was heading for a toy. She may be realizing the benefits of being mobile without waiting/crying for someone to help her walk.
Her preferred method of locomotion is still walking, and she's getting braver by the day about walking while using only one hand for support. She has started to let go with both hands to stand unassisted. She's bonked her head a few times but doesn't usually cry.
This is a video of Ella doing the belly crawl a few days ago while crying. At the end of the video, you'll hear her switch from crying to chattering as soon as she's up on her feet (about the span of a hearbeat!). The first part of the clip is a good example of the 'complaining' cry, and shows how quickly she can turn it off when she gets where she wants. I'll try and film a happy crawl and a clip of Ella sitting up later this week.
Ella crawling. from /michael. on Vimeo.