As mentioned, Sam loves to push his little car around. He can sort of fix bumps, but still cries in anger when he hits a blockade.
After a couple weeks of this he has started to walk! Just before he turned 1, I caught him taking little half-steps without assistance. Then I thought I saw full steps. On his birthday we had a couple two step sitings. This video is the day after his birthday.
And today, a day later, He took about 4-5 steps right in front of us!