Tyler has figured out how to go forward in his walker!  I was watching him over the weekend, and he would stand up and lean forward, stepping to keep his balance, and then the whole thing rolled forward a little.  I swear I could almost see the light go on in his head as he realized he could move himself foward.  It was so funny!  Now he is doing it pretty consistently, and has been motoring all over the kitchen. :)  I can also tell that he has gotten taller since we got the walker, because when we first got it, he could only touch the floor with the balls of his feet, and now he can put his entire foot on the floor.