You would probably have to use something the like Grim's to output checked speed
to a text file, then parse the code into your forums somehow (a few different ways
I can think of atm). Example would be from this thread:
http://www.vbhacks.us/forum/showthread.php?t=413 (view the first attachment).
Only 2 problems here.... First, the speed would be determined by the maximum speed
your own box is (assuming you run it from your machine), and the other is pulling
info from the board and sticking into Grim's as I have no idea how you would automate
such process. I'm sure if you had a *nix box to do this with, you might be able to
just use wget and parse its output to show only the rate of transfer, although that
in itself has a few other complications.
Basically, it would be pretty difficult to code and would depend on completely
static variables (ie operating system it's running on, program used to retrieve data).
You'd also need a specific file to retrieve on the str0, which I'm sure you could
code as either static or dynamic, the later being a bit more difficult.
If you could find a dedicated coder, I'm sure you could works things out,
but personally I wouldn't touch it.