I've been following along to your posts as well, and it obviously looks as though your son's team is out for an outstanding season. If they keep it up, they could be poised for a long run deep into the playoffs.
The regionals are great. I loved them not so much because of the level of play being higher, but because of the intensity of the situation. I've played on some showcase teams in the past and some pretty good summer teams, but none of those availed me of the opportunity to have the brotherhood that I felt during the tournament. Its a similar reason why I love March Madness so much...high quality athletes playing for nothing but the name on their jersey and the teammates that surround them.
Good luck to your son the rest of the way and if you have any more questions please don't hesitate to ask. As a junior pitcher whos probably been through some similar situations that your son might find himself in, I will try to help in any way