This page is a series of references, collected in May of 2002, dissing the use of drugs like Ritaline for the treatment of ADD. It will not be kept up to date, and will gradually become less current and useful. Feel free to link to it.
Methylphenidate (Ritalin):
http://hsc.virginia.edu/medicine/clinical/pediatrics/devbeh/adhdlin/methyl.html
http://www.rxlist.com/cgi/generic/methphen.htm
Dextroamphetamine (Dexedrine):
http://hsc.virginia.edu/medicine/clinical/pediatrics/devbeh/adhdlin/dextroamp.html
http://www.rxlist.com/cgi/generic/dextroamphetamine.htm
Clonidine (Catapress):
http://hsc.virginia.edu/medicine/clinical/pediatrics/devbeh/adhdlin/clonid.html
http://www.rxlist.com/cgi/generic/clonidin.htm