okay, here are two tcp stream graphs of a 315MB file i copied from work to home (I have comcast blast...)
feel free to ask any questions.
one is the entire stream, and the other is zoomed in to show the powerboost fall-off. you can see that after the falloff, the remainder of the download is pretty much a straight line (on the graph)
The fall off is after about 25 seconds, it drops down to 3.1-3.2MB/s sustained speed (approx 24Mbps) boosted is around 34Mbps..