In the consumer electronics video space there is a term called
'trick-play'. My understanding is that it is something like
fast-forward capability.  What exactly is "trick-play" and how does it
affect the throughput of the video?  Ie:  If I am watching an HDTV
video stream (20 Mbps) and I use trick-play, does the throughput of
the data increase by 25% or something?  I am paricularly interested in
reference to MPEG-2 Transport streams.

Well essentially a player enabled with trick-play means that the
player can play a video at rates of x0.5, x1.0, x1.5, x5.0, x10 and
x25 during both forward and reverse trick play. Well I haven't
understood the throughput part completely.. so looking into it right
now..