Can't post the video here, so check it out in the videos and podcasts here on PC. Very cute.
Here is the intro:

Since this particular family lives on the
outskirts of Anchorage , they decided to
build a sturdy, colorful playground for
their 3 and 4 year old sons, with
smooth-stone gravel all around it to
avoid knee scrapes and other injuries.

They finished building it on
Saturday evening, and the
following morning, as the Mom
was about to wake up the boys
and have them go out to play in
their new play center, this is what
she saw from the upstairs window: