So basically, when somebody asks you a question, it's better to answer it truthfully and possibly do some research on the answer, rather than just make up a bad answer?
Similarly, I tried the pgsql example on 8.4.13, although on FreeBSD rather than Windows like they suggest, and all I got was:
ERROR: floating-point exception
DETAIL: An invalid floating-point operation was signaled. This probably means an out-of-range result or an invalid operation, such as division by zero.
Don't forget that Flash also solves the problem of denying access to your selected media until unskippable ads have played, or overlaying said ads on top of the media you're trying to watch.
Probably to minimise the error inbetween updates. If the clock rate changes suddenly, then after that moment, any clocks based on the old rate will become increasingly wrong. but, if the skew starts off slow, begins to change rapidly, and then slows and stops again, then clients won't need to be immediately aware of the clock skew and will be less wrong.