http://www.decatursports.com/drills/base/baseball_drills_page.htm (has links to other coaching pages).
http://www.hsbaseballweb.com/ (more about scouting & college ball and what they look for)
http://www.baseballtips.com (check under free instructional articles).
http://www.webball.com (this is very good)
http://www.baseball-excellence.com/ (really more about philosophy of coaching)
http://www.qcbaseball.com/ (excellent site that also has a lot of info re strategies & tactics + has some excellent coaching templates).