The business of amplification being used by DCI drum and bugle corps this season is being discussed in the following forums:
Drum Corps Planet Forums
Discussion is also turning up in R.A.M.D. news group. For those of you who are not old school, (there was a time when newsgroups and e-mail _were_ the internet) you can read this group through Google at the following link. WARNING: people can post to newsgroups like this in a more or less anonymous way, this lends itself to bouts of extreme not-niceness.
I found the first link through Matthew Briddell's "Keep the Amps out of Drum Corps" web site.